I don't have a screenshot, but I'd like to describe a fort of mine that fits the bill. It was shaped kinda like a combination of the gravity gun and a flintlock pistol.
The entrance could be considered the flintlock hammer, with four stairs to the surface in the center, and a cemetary branching off of it like the piece of flint. The entrance connects with a lesser meeting hall (that would be the hinge of the flintlock or the core of the gravity gun), that has statues and such because dwarves pass through it so often. The branch from there going down the "barrel" includes all the housing, and the same blocky pattern of the gravity gun barrel (25 tile rooms, with three smaller exceptions). The branch going down the "trigger/greeble" curves into the meeting hall of the "handle". The branch strait towards the "handle" goes through the farming, butchery, and kitchen sections before the meeting hall (farming makes up the largest portion of the "handle"). Right below the "flintlock hammer hinge" and some of the "handle" butchery section is the workshops of the fortress, organized kinda randomly with stairs going up in strange places.
There's another one that's a lot more ~"chaotic" and utilized a meeting hall full of levers behind doors. I'm not sure what basic shape would describe it.
My main problem seems to be taking advantage of the multiple z-levels.