Any ideas? I'm currently drawin up some plans for a small 4' by 10' chicken coop with a slanted roof that has hinges on one side connected to the frame of the coop. It will be 40" inches high so the racoons cannot open it up. The door will open out with a latch on the inside so the racoons cannot get in at the chickens. There will also be some aluminum sheet metal nailed to the frame of the coop so mice an rats can't gnaw there way through(Or can they?). I just wanted to know if I should put some sort of barrier between the chickens and the metal. This is the first chicken coop I'll be building so I came here for some expert advice.