Thanks Guys. I should be more clear I guess, I cut these out of sheet styrene with my Probotix 3D router table, that’s how the window openings are so crisp. The windows themselves are resin castings. (And you can’t see it but they are not. quite. square. bleah 
The table is a kit, I don’t think they make them anymore but there are many similar ones around- they are sort of the poor man’s laser cutter.
I use a free program called Inkscape to make the vector drawings that I cut the parts with. If there is interest I can document my tool path and stuff, I use all free software but I don’t really have a page or anything I can point you to. Anyhow, I do have various ramblings about this and other things on my blog if you care to sift through it.
Martin
martinsant.net