Joe McGinn, the lead designer on the original game said your mod is amazing
in a reply to his own comment. www.youtube.com/watch?v=2PBIFunhha4&t=1s
"...the one where they combined all three maps into one drivable city ... amazing!..."
I took a look at this model again today and noticed that it could really do with some more improvements - in particular the normals on the model were very messed up. So, I went back and tidied up most of it and I think the shading looks a lot better now!
I also replaced the Phonebooth icon included in the mod, as the one I had before was uh...very bad. Hopefully this one is less bad.