Available at: http://www.brigademodels.co.uk/15mmSF/Colony%20Base.html
Brigade Models.co.uk have released an awesome new Colony Terrain Set.
There are a ton of different options, and the pieces even have indents for magnets, so you can configure them till you go crazy!
I have some of their other terrain, and their quality is top notch. If you're looking for colony buildings, or even to build a research base for the zombie apocalypse, check these out!
These are the sets, and you can also buy the parts individually.