please take a look at Sim Tower, if ye haven't already. i think it is one of the best games of all time and definitely worth a gander:
en.wikipedia.org/wiki/Sim_T...
anyway, i think it would be very cool if glitch had a series of levels in a giant tower, viewed as a cross section. it would be cool to have such a densely packed level, with people walking immediately above and below ye.
think en.wikipedia.org/wiki/File:... - including the elevators!