The Ground floor is a bit boring... basically just a big rectangle, with a couple gaurd towers.
This is my main floor Production area is too the left and sleeping on the right. the 3x3 up/down staircases lead to where my guard towers (or where they will be guard towers.) The Guard towers are 4 Z levels high 7x7 squares with a couple level of barracks. The top level are fortifications for my Marksdwarves to rain bolt death from.
Eventually the guardstowers will be come the struts of a huge pyramid. I'm planning making mostly out of gold and silver. I haven't done any calculations so I'm hoping I'll have enough.
This is the level below the main level... its where materials for all the workshops are stored, also important is the main mine track for hauling stuff between stations.
The big open area is the vaulted ceiling of the dining room... I goofed there and didn't allow a path to smooth the walls up there... I might build some scaffolding at somepoint and fix it, but it's a lower priority.
And speaking of the main hall... It needs a few more coffins and tables... but you get the gist.
The next level down is my auxillary storage for furniture, weapons, everything I don't want on the materials or production level. It's ugly but functional
Below that is the start to my mining