Build a 600-block-wide, 7-level und...

Build a 600-block-wide, 7-level underground base with a symmetrical layout and central core. Each level has a hub with branching corridors and is fully connected. Levels include: entrance, storage, farms, villager trading, living area, nether/mob systems, and a secure vault. Style is futuristic using quartz, glass, and bright lighting. Include a surface mansion entrance, hidden access points, decorative elements, and ensure the structure is complete and fully functional.