Spoiler
Level 0: Walls, doors, and traps surround our hole in the ground. We can lock the doors in a pinch, but we'll still need to set up a drawbridge to close off our caravan entrance. The yellow bars are honeybee hives maintained by Slorange... still deciding where we should ultimately put them. Maybe on the roof?
Level -1: Our entry tunnel. Green cage traps at the base of the stairs going up(where they won't block the caravan ramp), and cheap white stonefall traps in front of the stairs going down. Hatch covers on top of the three stairways going down, which we can lock if necessary.
Level -2: Farms, farmer's workshop, and seed stockpile.
Level -3: Well access and hospital/barracks (under construction)
Level -4: Dining hall, food storage, kitchen, still, fishery, butcher, and animal byproduct industries (leather and soap). Note the cute little duck hatcheries on the left and right. Well water sewer tunnel is on this level.
Level -5: Workshops and stockpiles. Also housing. Will need some doors soon to keep out the workshop noises so dwarves can get a good night's rest.
Level -6: More housing. These quarters are rather massive, in dwarf terms.