I would personally go with cats + woodshavings = mess, but hilarity works, too. ^_^

The floor itself took about two weeks to complete, and the only thing that I didn't do myself was cut the piece of wood down to size (they did that for me at the store when I bought it). I actually built the set completely on my own, aside from cutting the wood, and I even did some that. I would have done more, but don't have the equipment.