A massive, fully hollow underground...

A massive, fully hollow underground Minecraft survival base grid layout. Absolutely NO solid block filler and NO exterior decorative statues. The entire build must consist of walkable, hollow rooms with 5-block high ceilings, connected by open stairs and walkways. Architecture style uses sandstone blocks and dark oak wood supports. The central room is a large hollow cavern containing a water pool and a leafy tree structure, but it must be completely open and walkable around the edges. Branching off the center are separate, empty, hollow rooms designated for a chest storage area, an enchanting room, a furnace setup, a Nether portal room, and a bedroom. Keep walls thin (1 to 2 blocks thick maximum) to ensure maximum usable, empty interior space.