This is my workshop level. The central circle was going to be a finished goods stockpile (the staircase in the center leads near the Trade Depot). The ring around that is a hall for access. From that ring is several hallways that lead to various workshop pods, representing a raw stockpile type. From the bottom and going clockwise: Seige, Stone, Magma Forges/Furnaces/Smelters, Wood, Jewelry/Bone Carvers/Leatherworks/Clother, Food Related (Butchery and Tanning, Food Workshops, etc.). The bottom right does not have a designation, but can be used for spillover if one industry needs more space for workshops. The forges workshop is extended out so the magma underneath doesn't interfere with other stockpiles. The bottom left is left blank for my future Obsidian farm.
To the right of the food-based workshops is the Still and Kitchens, and to the right of that is the raw food stockpile on the top and the prepared food and brew stockpile on the bottom.
Between the forges and wood workshops is housing.
Just above the wood workshops is what would have been a underground tree farm like Pagebend's. It goes for several Z-Layers in each direction. Just needed to flood it and breach the caverns.
The massive carved out area around everything was going to be a underground river like Walledwar's. That would have led to a large underground lake. On the sides of the river were spots not being carved for housing. The nobles have their towers above ground, but everyone knows these houses on the river are superior. The lake would have had islands as well, with specialized housing for a few of my Legendary dwarves, so they could go straight from their room to their workshop, and would have the works to keep them joyous little seamonkies.
On the note of Noble's Towers, here's the one I had built and almost finished. The ramp off the side leads to his personal Dining Room at my grand (unnamed) dining area.
Here's the afore-mentioned Dining Area. There are several layers with tables and chairs pointing in. 2 of the layers are for nobles: 1 for various minor nobles, and 1 for the king all to himself. This whole area would have had seating for over 1000, not including the Noble's dining areas, each of which has room for 4 people at a time. At the "empty" end of this area would have been an execution tower. Prisoners would have been placed at the top in traditional execution tower style, and released periodically for those dining. Dinner and a show.
This is the burial tree. The branches are currently under construction. Off of these branches would have been small 2x2 rooms containing 1 coffin and 1 statue, 1 for each dwarf. These rooms would have been made of Green Glass, and would have represented the leaves of the tree. The nobles would have had larger 6x6 or 7x7 (I don't have a set size yet) rooms made of cinnabar and well furnished, representing the fruit of the tree. As the fortress grows and ages, the dwarves would be "buried" here, and the tree grows. The tree ensures the ancestors of those living at the fort would be watching over future generations.
I give all of these would haves and whatnot because I'm starting a new fort. All of these ideas will be in the fort, but I'm starting over, with a bit more "this fort needs to be bigger and a testament to Dwarfkind" mentality.
Anyways, these are the more interesting areas of my fort.