A further image. I imported into gmax the area model. The entire 'central' area, consisting of all the walkways (but not the accessible rooms) is in one area model. There are a lot more rooms than we realised, some much further up, but I can't see how the player would get to them.
I also extracted the walkmesh:
The purple bits represent the walkways past the cantina, the Dobo shop, and the TSF office. The rest, as can be seen, is highly fragmentary, and lacks the purple 'walls' on those areas which are complete (perhaps explaining the wall-clipping in the areas we've been able to jump to?)