In some of the shots, you can see the blurred motion of the painter, so it seems like each frame is individually drawn. I wonder how you make them so precisely? (well, relatively) Probably it's just a lot of practice, but I could imagine putting some sort of template behind the camera that you could use to line up each drawing, or at least some key points. More likely, it's just a lot of practice.
Update: Or you could just watch this video on how they did it... How to freeze light.
Here's another beautiful barn/garage. It's a shame to cover up the diagonals; they look very cool. The only way I can think to improve on this would be to build one of those round Shaker barns.