DESIGN CONSTRAINTS

- Do not model buildings.
- Do not model full walls except retaining/canal/bridge support walls needed by terrain.
- Do not model roofs.
- Do not model decorative clutter except minimal drains/grates required to communicate tile purpose.
- Avoid tiny details.
- Prioritize edge alignment, walkability, and builder usefulness.
- Keep polygon counts low.
- Keep all tile edges snap-clean.
- Avoid overhangs at tile boundaries.
- Avoid geometry extending beyond -5/+5 bounds unless it is an explicitly marked harmless visual trim.
- Use bevels sparingly.
- Prefer clean simple geometry over visual polish.
- Use material slots consistently so final textures can replace prototype materials later.