Ballistic Addon Studios (see link above) is also working on Delta operatives, which could also come in handy with what you are doing, I would assume.
As for the Somalian style buildings, I do not know of anyone who is working on that, but it would be sweet to see an entire custom map for the Black Hawk Down scenario (to supply the millions of people making BHD missions--not that it is necessarily a bad thing).
I would suggest keep playing with Oxygen, the learning curve is not so steep if you have plenty of people here to help with specific problems. If you have BHD the movie on DVD, you may be able to make textures from video captures, although I am not sure how many clear shots they have of houses (I have not seen the movie myself yet.)