Here is a complete, single-file HTML solution containing the 3D WebGL scene.
This creates a visualization of the "Wing-Spar" seastead based on your dimensions. It uses **Three.js** (loaded via CDN) to render the model.
### Key Features in the Visualization:
1. **The Wing-Spar:** Modeled as a large, semi-transparent structure (to see the internal floors). The waterline is set at Y=0, with 70% of the 39ft structure below water.
2. **Internal Floors:** 5 floors are visible inside the structure.
3. **Thrusters:** 8 RIM-drives (4 per side) are positioned along the underwater section.
4. **Top Deck:** Includes the 20x20 platform and the 30x30 solar shade.
5. **Ballast:** A cable extends 100ft down with rotating fairings.
6. **Interactivity:** You can click and drag to rotate, scroll to zoom, and right-click to pan.
Save the code below as an `.html` file (e.g., `seastead.html`) and open it in any modern web browser.
```html
MVP Seastead - Wing Spar Design
Wing-Spar Seastead MVP
39ft Long | 70% Submerged | 5 Floors | Ballast 100ft Down
Left Click: Rotate | Right Click: Pan | Scroll: Zoom
```