I built up some buildings with the help of my buddy, Flick, last night. I used a bunch of terrain pieces from http://www.antenocitisworkshop.com/governance-of-technology/g-o-t-scenery-15mm.html Antenocitis Workshop. The doors and windows and grills and such were really well cast and a great bargin, since you get a bunch in the packs.
This is from an inkjet cartridge shipping container.
This is from MicroPanzer.
Electrical boxes. We used a heat gun to soften the grill on the side, and then stuck it on to get the curve.
And the first set. Really easy and they look great on the table!