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.
Rest in piece, Donuts of Steel. Rest in Hell, Level 6 observatory. v1.01 should fix that crash which I still wasn't able to get. I had someone else test the fixes for me. Also, Donuts of Steel was made easier.