I've uploaded the map to the beta server (see PM for details). In the earlier beta, the lighting looked bad, but the fog kind of helps with that. Since the sun is at such an extreme angle, and the sun lighting ends up looking almost uniform, you might want to just do away with sun lighting and use straight up sky lighting.
Also, make sure you make your map file names all lower case. I've renamed the file to oslo_b3.bsp on the beta server. Linux is case sensitive.