Recorded a demo with suggestions.
I'm not sure if it's just an issue with the palette for the lighting, but the map seemed a bit too dark overall. It was hard to see clearly in a lot of areas. It should be possible to fix the lighting issue with the proper colormap.pcx. Or you can grab the bsp pack, copy your .map to the mapfiles subdirectory, and open and export it from there.
Map is also up in rotation on the beta server. Let me know if you need the login.