Thanks guys.
John and Tom, I still haven't made up my mind whether or not to just glue the doors shut. I originally thought about making better metal hinges but didn't. I'm not sure about going the magnet route either. The problem with the doors on these kits is, not only don't they usually stay closed, but, when they're opened, they usually sag because of the crappy hinges. I'm leaning towards the "glue them shut" option.