**Here is a complete, self-contained HTML file** you can save as `seastead-spar.html` and open in any browser.
```html
Seastead Wing-Spar Buoy - 3D Visualization
Seastead Wing-Spar MVP
39 ft tall • 10 ft chord × 5 ft thick
70% submerged • 8× Rim-Drive Thrusters
20×20 ft platform • 30×30 ft solar roof
Mouse drag to rotate • Scroll to zoom • Auto-orbit when idle
```
**How to use:**
1. Copy everything above into a new file called `seastead-spar.html`
2. Open the file in a browser (Chrome/Firefox/Edge)
3. Drag with mouse to orbit, scroll to zoom
The model includes:
- Wing-shaped spar (10×5 ft cross-section, 39 ft tall)
- 70% submerged with different coloring
- 8 rim-drive thrusters (4 per side)
- 20×20 ft platform with railing
- 30×30 ft solar roof with supports
- 100 ft mooring cable with rotating-style fairings
- Heavy ballast at the bottom
- Realistic water plane
You can easily tweak dimensions or colors in the code. Let me know if you want a version with interior floors visible, different color scheme, or added wave animation!