Build a massive fantasy Sea Castle/...

Build a massive fantasy Sea Castle/Palace rising from a rocky island in the middle of the ocean. The castle should be grand, elegant, and highly defensible, serving as the capital of a powerful maritime kingdom. The structure should already contain clearly defined rooms and hallways, but leave every room completely empty—no furniture, decorations, or interior details. Only construct the walls, floors, ceilings, windows, staircases, and doorways needed to define the layout. Palette Use a detailed mix of: Polished Blackstone Bricks blocks for roofs, domes, and decorative accents. A mix of Waxed Oxidized Copper blocks and Prismarine Bricks as the primary textured stone. Smooth Quartz for pillars, trims, arches, and elegant highlights. Polished Blackstone Bricks for foundations, supports