As a first attempt at releasing an MP map, I have started working on "mp_warehouse".
It'll be a small-medium sized urban level with a mix of close-quarter environments and longer sight lines. I haven't finalised a layout yet, but am working through the map and have made enough progress on the allied spawn side to show a few pictures of it:
As you can see I have already used some custom textures as well as existing ones brought over from Call of Duty 4. However I'm still going for a WWII themed warehouse, which will have an abandoned look rather than a wartorn one.