"A single-floor circular hub carved...

"A single-floor circular hub carved into a mountain, fully enclosed underground. Center: a stone pillar wrapped in a spiral staircase. A ring corridor circles it. Smooth stone with cherry wood trim. Three rooms branch off: kitchen, living room, storage room. Main feature: a grand automatic double door at the entrance — massive wood-panel doors, several blocks tall, framed by tall stone pillars and a stepped wooden archway. The doors are large moving wall panels opened by a piston and slime block mechanism: a button press triggers pistons pushing slime blocks, sliding the huge door panels into hidden wall cavities, fully automatic, closing again after a few seconds. Monumental, fortress-gate look."