The prompt behind this build
Create a Minecraft Java Edition structure with an exact 20-block front width and 20-block depth. It must be a symmetrical, desert-temple-inspired ocean house built on the water surface. Use sandstone, smooth sandstone, cut sandstone, orange terracotta, stairs and slabs. Include two decorative towers, a grand central entrance, detailed orange terracotta patterns, and an underwater staircase leading into a corridor. Show the entire build in a 3D preview and provide an exact layer-by-layer construction guide, with the coordinates of each block, block types, block counts and correct stair and slab orientations. Keep the structure within the 20×20 footprint and make it practical for survival mode. Show the foundation first, then each successive layer until the finished structure.