While I have terrain for Middle Eastern/North Africa in place, I am not sure if it will work for South West Africa, but it will have to do. I have a few options for base terrain, either use my desert tiles from The Terrain Guy (sadly no longer in business) or I can use a green felt cloth from Monday Knight Productions. For buildings I have several of the Deimos Design Studio hand-made offerings (again, sadly they are no longer in business), along with some shanties (customer built in a trade for figures). I have a variety of desert-type rock outcroppings as well. Pretty sure the shanties wouldn't work based on the tin roofs though.
I'll have to pull out all the terrain I have and snap some pictures. In the meantime here are some pics that show the Deimos buildings, the shanties, and The Terrain Guy base tiles.