Note that our survivalist friend has learned a few things from the mistakes of his late neighbors. First off, the windows are boarded-up with metal bars, not easily ripped apart wood. The bars were made from leftover plastic sprues cut to length and painted metal color.
The door is reinforced metal that no zombie horde will be bashing in anytime soon. The door is simply plasticard cut to fit. To make the rivets, I "dimple" the plasticard with a drill-bit, very carefully pushing and turning it on the backside to slowly dimple it out. It's real easy to puncture the plasticard, and then you end up with a hole where a rivet should be. It's not my favorite technique but I'm too lazy to punch out little tiny round disks (rivets) and glue them on.
I made a little escape-hatch on the roof from some balsa-wood and plasticard. I figured our homeowner would crash up there every so often, so I added a couple of worn-out mattresses too. Even the roof is reinforced with metal. I tend to use a lot of corrugated metal in my post-apocalyptic terrain, so I ended buying a paper-crimper from a craft store.
The crimper makes takes stiff paper and turns it into great-looking corrugated metal.
I have a couple more homes in the process of being built, so stay tuned!