**Here's a complete, self-contained HTML file** that creates an interactive 3D WebGL visualization of your tensegrity seastead using Three.js:
```html
Tensegrity Seastead - 3D Visualization
Tensegrity Seastead • Drag to rotate • Scroll to zoom
```
**How to use:**
1. Copy all the code above
2. Save as `seastead.html`
3. Open the file in a browser
**Features:**
- Accurate geometry based on your dimensions and 45° angles
- Proper tensegrity cable layout (base triangles + crossed support cables)
- Wing-shaped legs with correct orientation for forward motion
- Rim-drive thrusters mounted on each leg
- Interactive OrbitControls (drag to rotate, scroll to zoom)
- Water plane at Z=0 with legs ~60% submerged
Would you like me to add any modifications (different colors, labels, animation of movement, better wing airfoil shape, etc.)?