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The upper district is tall enough for the main structure to house 14 floors, plus free-standing buildings on the terraces. The lord high's palace is the cylindrical bit at the center, surmounted by a lighthouse. The bottom features a huge illusion of a sun (or a moon, depending on the time of the day.) Colossal chains anchor the upper district's various sections in place. The view above is a cross section, except for the palace, which I've not cut through. Internal ceilings are 9-10' high for most places. A short entry about each floor in the palace (matching the story at the beginning of the book), a general "street" diagram of the levels inside the surrounding sections, and the location of important features listed in the book give an idea of how the district is put together. Specific layout details are left to the referee (like any other fantasy city). Even more details on encounters, personalities, monsters, and specific locations follow in the book about the other two districts: plenty to start writing adventures!