So this is my first shot at a 42.xx fort. I got a really nice embark with shear walls going up around a volcano and an open plain in front of the fort. It's even got magnetite.
The central open space is the main hall of the fort. The next level down is it's floor. The well and tavern are on the left side of the main hall. The tavern has lots of cobaltite tables and chairs. The stockpile is to the left of that. It looks like it's time to fire up the stills. The ramp on the south side of the tavern goes up to the rooms. Some of them overlook the tavern and I'll put windows in those.
The two open spaces to the south with pillars are the two principle temples of this fort. Others will get less auspicious placement later. Their floors are also both down one z level. On the right is Nitish the God of War and Fortresses. I already got a masterwork steel statue of dwarves praying to him as the centerpiece of the temple. I've got no trees so getting pearlash is slow, but eventually I'll put in a glass block floor for the whole temple with the arena below.
The temple on the left is for Nëbush the Goddess of light and rebirth. Once I get another blacksmith up to legendary I'll start working on a silver statue for her and encrust it in gems. I put the crypt below her temple and cut a shaft up 20 some Z levels directly above where her statue will be so she will have light shining down on her from above. I smoothed the walls and put an iron grate at the bottom. Hopefully that will keep any nasties out. Can fliers and such attack grates they are standing on?
Also on the right of the main hall is the library, clothing industry and mayor's office and quarters. The King's throne room will be to the south of the temples again. At a higher Z-level, in fact, which surely symbolizes something.