diff --git a/atomizer-dashboard/frontend/src/components/canvas/panels/IntrospectionPanel.tsx b/atomizer-dashboard/frontend/src/components/canvas/panels/IntrospectionPanel.tsx
index 633d5e23..087f7b33 100644
--- a/atomizer-dashboard/frontend/src/components/canvas/panels/IntrospectionPanel.tsx
+++ b/atomizer-dashboard/frontend/src/components/canvas/panels/IntrospectionPanel.tsx
@@ -15,6 +15,10 @@ import {
   FlaskConical,
   SlidersHorizontal,
   AlertTriangle,
+  Scale,
+  Link,
+  Box,
+  Settings2,
 } from 'lucide-react';
 import { useCanvasStore } from '../../../hooks/useCanvasStore';
 
@@ -316,6 +320,180 @@ export function IntrospectionPanel({ filePath, studyId, onClose }: Introspection
               )}
             </div>
 
+            {/* Mass Properties Section */}
+            {result.mass_properties && (
+              <div className="border border-dark-700 rounded-lg overflow-hidden">
+                <button
+                  onClick={() => toggleSection('mass')}
+                  className="w-full flex items-center justify-between px-3 py-2 bg-dark-800 hover:bg-dark-750 transition-colors"
+                >
+                  <div className="flex items-center gap-2">
+                    <Scale size={14} className="text-blue-400" />
+                    <span className="text-sm font-medium text-white">Mass Properties</span>
+                  </div>
+                  {expandedSections.has('mass') ? (
+                    <ChevronDown size={14} className="text-dark-400" />
+                  ) : (
+                    <ChevronRight size={14} className="text-dark-400" />
+                  )}
+                </button>
+
+                {expandedSections.has('mass') && (
+                  <div className="p-2 space-y-1">
+                    {result.mass_properties.mass_kg !== undefined && (
+                      <div className="flex justify-between p-2 bg-dark-850 rounded text-xs">
+                        <span className="text-dark-400">Mass</span>
+                        <span className="text-white font-mono">
+                          {(result.mass_properties.mass_kg as number).toFixed(4)} kg
+                        </span>
+                      </div>
+                    )}
+                    {result.mass_properties.volume_mm3 !== undefined && (result.mass_properties.volume_mm3 as number) > 0 && (
+                      <div className="flex justify-between p-2 bg-dark-850 rounded text-xs">
+                        <span className="text-dark-400">Volume</span>
+                        <span className="text-white font-mono">
+                          {((result.mass_properties.volume_mm3 as number) / 1e9).toFixed(6)} m³
+                        </span>
+                      </div>
+                    )}
+                    {result.mass_properties.surface_area_mm2 !== undefined && (result.mass_properties.surface_area_mm2 as number) > 0 && (
+                      <div className="flex justify-between p-2 bg-dark-850 rounded text-xs">
+                        <span className="text-dark-400">Surface Area</span>
+                        <span className="text-white font-mono">
+                          {((result.mass_properties.surface_area_mm2 as number) / 1e6).toFixed(4)} m²
+                        </span>
+                      </div>
+                    )}
+                    {Array.isArray(result.mass_properties.center_of_gravity_mm) && (
+                      <div className="flex justify-between p-2 bg-dark-850 rounded text-xs">
+                        <span className="text-dark-400">CoG (mm)</span>
+                        <span className="text-white font-mono text-right">
+                          [{(result.mass_properties.center_of_gravity_mm as number[]).map((v: number) => v.toFixed(1)).join(', ')}]
+                        </span>
+                      </div>
+                    )}
+                    {typeof result.mass_properties.num_bodies === 'number' && (
+                      <div className="flex justify-between p-2 bg-dark-850 rounded text-xs">
+                        <span className="text-dark-400">Bodies</span>
+                        <span className="text-white font-mono">{result.mass_properties.num_bodies}</span>
+                      </div>
+                    )}
+                  </div>
+                )}
+              </div>
+            )}
+
+            {/* Linked Parts / File Dependencies Section */}
+            {result.linked_parts && (
+              <div className="border border-dark-700 rounded-lg overflow-hidden">
+                <button
+                  onClick={() => toggleSection('linked')}
+                  className="w-full flex items-center justify-between px-3 py-2 bg-dark-800 hover:bg-dark-750 transition-colors"
+                >
+                  <div className="flex items-center gap-2">
+                    <Link size={14} className="text-purple-400" />
+                    <span className="text-sm font-medium text-white">
+                      Linked Parts ({(result.linked_parts.loaded_parts as Array<{name: string}>)?.length || 0})
+                    </span>
+                  </div>
+                  {expandedSections.has('linked') ? (
+                    <ChevronDown size={14} className="text-dark-400" />
+                  ) : (
+                    <ChevronRight size={14} className="text-dark-400" />
+                  )}
+                </button>
+
+                {expandedSections.has('linked') && (
+                  <div className="p-2 space-y-1 max-h-48 overflow-y-auto">
+                    {((result.linked_parts.loaded_parts as Array<{name: string, path: string, leaf_name: string}>) || []).map((part) => (
+                      <div
+                        key={part.path}
+                        className="p-2 bg-dark-850 rounded"
+                      >
+                        <p className="text-sm text-white">{part.name}</p>
+                        <p className="text-xs text-dark-500 truncate" title={part.path}>
+                          {part.leaf_name || part.path.split(/[/\\]/).pop()}
+                        </p>
+                      </div>
+                    ))}
+                    {((result.linked_parts.loaded_parts as Array<unknown>) || []).length === 0 && (
+                      <p className="text-xs text-dark-500 text-center py-2">No linked parts found</p>
+                    )}
+                  </div>
+                )}
+              </div>
+            )}
+
+            {/* Bodies Section */}
+            {result.bodies && (result.bodies.counts as {total: number})?.total > 0 && (
+              <div className="border border-dark-700 rounded-lg overflow-hidden">
+                <button
+                  onClick={() => toggleSection('bodies')}
+                  className="w-full flex items-center justify-between px-3 py-2 bg-dark-800 hover:bg-dark-750 transition-colors"
+                >
+                  <div className="flex items-center gap-2">
+                    <Box size={14} className="text-orange-400" />
+                    <span className="text-sm font-medium text-white">
+                      Bodies ({(result.bodies.counts as {total: number})?.total || 0})
+                    </span>
+                  </div>
+                  {expandedSections.has('bodies') ? (
+                    <ChevronDown size={14} className="text-dark-400" />
+                  ) : (
+                    <ChevronRight size={14} className="text-dark-400" />
+                  )}
+                </button>
+
+                {expandedSections.has('bodies') && (
+                  <div className="p-2 space-y-1">
+                    <div className="flex justify-between p-2 bg-dark-850 rounded text-xs">
+                      <span className="text-dark-400">Solid Bodies</span>
+                      <span className="text-white font-mono">{(result.bodies.counts as {solid: number})?.solid || 0}</span>
+                    </div>
+                    <div className="flex justify-between p-2 bg-dark-850 rounded text-xs">
+                      <span className="text-dark-400">Sheet Bodies</span>
+                      <span className="text-white font-mono">{(result.bodies.counts as {sheet: number})?.sheet || 0}</span>
+                    </div>
+                  </div>
+                )}
+              </div>
+            )}
+
+            {/* Units Section */}
+            {result.units && (
+              <div className="border border-dark-700 rounded-lg overflow-hidden">
+                <button
+                  onClick={() => toggleSection('units')}
+                  className="w-full flex items-center justify-between px-3 py-2 bg-dark-800 hover:bg-dark-750 transition-colors"
+                >
+                  <div className="flex items-center gap-2">
+                    <Settings2 size={14} className="text-gray-400" />
+                    <span className="text-sm font-medium text-white">
+                      Units ({(result.units as {system?: string})?.system || 'Unknown'})
+                    </span>
+                  </div>
+                  {expandedSections.has('units') ? (
+                    <ChevronDown size={14} className="text-dark-400" />
+                  ) : (
+                    <ChevronRight size={14} className="text-dark-400" />
+                  )}
+                </button>
+
+                {expandedSections.has('units') && (
+                  <div className="p-2 space-y-1">
+                    {(result.units as {base_units?: Record<string, string>})?.base_units && 
+                      Object.entries((result.units as {base_units: Record<string, string>}).base_units).map(([key, value]) => (
+                        <div key={key} className="flex justify-between p-2 bg-dark-850 rounded text-xs">
+                          <span className="text-dark-400">{key}</span>
+                          <span className="text-white font-mono">{value}</span>
+                        </div>
+                      ))
+                    }
+                  </div>
+                )}
+              </div>
+            )}
+
             {/* Extractors Section - only show if available */}
             {(result.extractors_available?.length ?? 0) > 0 && (
             <div className="border border-dark-700 rounded-lg overflow-hidden">
diff --git a/atomizer-dashboard/frontend/src/pages/CanvasView.tsx b/atomizer-dashboard/frontend/src/pages/CanvasView.tsx
index b5784eb0..7189322c 100644
--- a/atomizer-dashboard/frontend/src/pages/CanvasView.tsx
+++ b/atomizer-dashboard/frontend/src/pages/CanvasView.tsx
@@ -296,17 +296,34 @@ export function CanvasView() {
 
         {/* Action Buttons */}
         <div className="flex items-center gap-2">
-          {/* Save Button - only show when there's a study and changes */}
-          {activeStudyId && (
+          {/* Save Button - always show in spec mode with study, grayed when no changes */}
+          {useSpecMode && spec && (
             <button
               onClick={saveToConfig}
-              disabled={isSaving || (useSpecMode ? !specIsDirty : !hasUnsavedChanges)}
+              disabled={isSaving || !specIsDirty}
               className={`px-3 py-1.5 text-sm rounded-lg transition-colors flex items-center gap-1.5 ${
-                (useSpecMode ? specIsDirty : hasUnsavedChanges)
+                specIsDirty
                   ? 'bg-green-600 hover:bg-green-500 text-white'
                   : 'bg-dark-700 text-dark-400 cursor-not-allowed border border-dark-600'
               }`}
-              title={(useSpecMode ? specIsDirty : hasUnsavedChanges) ? `Save changes to ${useSpecMode ? 'atomizer_spec.json' : 'optimization_config.json'}` : 'No changes to save'}
+              title={specIsDirty ? 'Save changes to atomizer_spec.json' : 'No changes to save'}
+            >
+              <Save size={14} />
+              {isSaving ? 'Saving...' : 'Save'}
+            </button>
+          )}
+          
+          {/* Legacy Save Button */}
+          {!useSpecMode && activeStudyId && (
+            <button
+              onClick={saveToConfig}
+              disabled={isSaving || !hasUnsavedChanges}
+              className={`px-3 py-1.5 text-sm rounded-lg transition-colors flex items-center gap-1.5 ${
+                hasUnsavedChanges
+                  ? 'bg-green-600 hover:bg-green-500 text-white'
+                  : 'bg-dark-700 text-dark-400 cursor-not-allowed border border-dark-600'
+              }`}
+              title={hasUnsavedChanges ? 'Save changes to optimization_config.json' : 'No changes to save'}
             >
               <Save size={14} />
               {isSaving ? 'Saving...' : 'Save'}
@@ -314,7 +331,7 @@ export function CanvasView() {
           )}
 
           {/* Reload Button */}
-          {activeStudyId && (
+          {(useSpecMode ? spec : activeStudyId) && (
             <button
               onClick={handleReload}
               disabled={isLoading || specLoading}