Generate a Minecraft structure desi...

Generate a Minecraft structure designed as a modular shell for procedural generation. STRICT REQUIREMENTS: - Empty interior (no furniture, no clutter) - Clean symmetrical design - Flat floor and flat ceiling - Exact dimensions must be followed - Wall thickness must be exactly 2 blocks - Doorways must be centered on walls - Door size must be exactly 2 blocks wide and 3 blocks tall - All geometry must align perfectly to grid - No irregular shapes or uneven surfaces - Designed to connect seamlessly with other modules STYLE: - Futuristic underground base - Clean, minimal design - Materials: smooth quartz, smooth stone, glass, sea lanterns - Minimal decoration, prioritize structure CRITICAL: - prioritize clean geometry over decoration