It's made with a dollhouse door on foam core board. I saw this DIY site with tricks for doing miniature buildings and picked up some of the board to give it a try. I chuckled while making it using the guy's instructions because it was harder than he makes it sound(apparently he was being sarcastic when he said "and you will have lots of fun peeling off the top layer of the foam core"). Maybe it was just lost in translation, hehehe. Or maybe he really does like the peeling part. But once it was off it was a lot of fun.
Here is the site, I am nowhere near the amazing detail this guy can do, but I will keep trying for sure.http://www.009.cd2.com/members/how_to/nouaillier_a.htm