Are those custom scenes?
If you give me the 5 standard forms of rooms (dead end, corridor, L-shape, t-shape, cross-junction) I can probably figure out how to make the maze randomly generated.
EDIT: Ok, I see you said you haven't tried modelling, so I guess not. Anyway standard rooms are really easy to model, just a pain to prop. Hmmm. If I make a barebones random dungeon, would you help me prop it? It would be the first "roguelike" mod.