**Here's a complete, self-contained HTML file** that creates a 3D WebGL visualization of your seastead using Three.js.
```html
Seastead 3D Visualization
Seastead Tensegrity Platform • Drag to rotate • Scroll to zoom
```
**How to use:**
1. Copy everything above into a file called `seastead.html`
2. Open the file in a browser (Chrome/Firefox/Edge)
3. Drag to rotate, scroll to zoom
The model includes:
- Triangular truss platform with railing
- Three 39ft airfoil legs at 45° with correct orientation
- All tension cables (including underwater triangle)
- Living area with tapered shape and extended solar roof
- Two RIB boats with davits
- Rim-drive thrusters on legs
- Water plane
Would you like me to add stairs, more detailed truss work, or any other refinements?