The problem I'm running into mainly is working out where the stairs connect to from one level to another. There's two staircases marked on the map in area 17, which I'm assuming go from map 3 to map 2, but I can't see exactly where on map 2 they emerge...
Also I've noticed there's a staircase just to the south of Area 3, and I'm not sure from reading whether that staircase goes up to area 24 (it looks roughly right on the map) or stays on that level (there's a corridor running on the map immediately after it.
Any pointers gratefully received