We are almost done with the frame of our coop, we decided on a 4x6, with the run underneath of it for a smaller footprint. We (I) am hoping to add onto the run in the near future. We are trying to decide what to do for the roof . My husband wants metal, but I thought I read something about condensation problems with that...we have a limited budget. Also, what will work best for the floor, burying cinder blocks 6" deep to prevent diggers...we have some stray neighborhood cats...maybe a raccoon, although I have never seen one. Or does it work best putting a layer of chicken wire down? Ventilation. What is the minimum needed? Does the coop need to have windows? We have spent hours looking at different designs, and are combing a couple different ones, that fit our needs.