I'm thinking of moving in with a few guys to a house that only has 3 bedrooms which will all be full. But there's also a huge den that has 3 solid walls, and a 4th wall that has a big open archway (the width of about two doors). Is there a simple way to install some temporary doors or something similar into the den without making it permanent? A few screws in the walls would be fine but I don't think I'd be allowed to start remodeling...