I think my basic parts are done. I'll list them here for future reference. Almost each piece has a lit and unlit version. For example I didn't feel it was necessary to light the corner room pieces.
Corridor
Straight
T merge
Bend
Crossroads
Door
Dead end
Collapsed roof (dead end variant)
Suspicious bricked up corridor with holes (dead end variant)
Holes in the roof for sunlight
Collapsed floor to abyss (dead end variant)
Room
Wall
Wall with door
Corner
Inverted corner
Double inverted corner (Inverted corner on opposite sides, for small corner rooms or whatever)
Corner with right door
Corner with left door
Empty
Collapsed floor to abyss
Special
Stairs
Grate on the floor (to the level below)
Broken grate on the floor
Ruined grate/hole in the floor
Miscellanous
Store
Boss room?