Ok, some screens here

On the last picture you can see somethings still wrong with the color of the windows. They should all be light blue but the front windows and the upper one get no color.
I have to find out what's the reason for it. It has to do with the polys, but they are all set to the same parameters. Maybe a single or double-sided problem.
I will try to find the error and fix it.

P.S: Screens are made with 800x600, cause thats the only possibility to run in windowed mode I need to save the screenshots. Don't know why its limited to 800x600 in windowed mode, cause I think it was also possible in 1024x768 and even 1366x768 with windowed mode. Also something I have to find out.