Here is a complete, single-file HTML solution containing exactly the 3D WebGL seastead scene you described.
It uses the popular **Three.js** library to render the geometry and environments. I built everything exactly to your scale descriptions (1 unit = 1 foot) and mapped the elements conceptually as requested.
### Instructions:
1. Save the code below as a `.html` file (for example, `seastead.html`).
2. Double-click the file to open it in any modern web browser.
3. **Controls:** Left-click and drag to rotate the camera, right-click and drag to pan, and scroll to zoom.
```html
Seastead Tensegrity Concept
Seastead Concept - Left-click to Rotate, Scroll to Zoom, Right-click to Pan
```