Check out the you tube video with Tom Garner and his kennels he builds. They are nice and work out to be rather large. I have raised brood pens, one is 10X4 and the other is 9X5...Built out of custom deck leftovers. One floor is 5/4 decking board with an 3/4 inch gap. The other is cement decking board with a 3/4 inch gap. EWO