I bet you can get the old Quake level editor and put these into a full 3d model that the characters can navigate through. I remember trying to do that with our local shopping mall, way back in the day. However my artistic ability does not live up to such challenges.

A mid sized to large dive Bar I used for a recent run, includes main (front) bar, pool room (back), back office / kitchen / storage, area, and 1m / 10m scale indicators, for when determining range is important ...

http://homepage.mac.com/codemonkey_uk/SR4/bar_floorplan.pdf

HTH