I just finished the build for my duck coop. It is 8' x 4'. I used 3 full sheets of plywood. One on top, one on bottom, and the other cut in half and used on each side. The boards for the front and back are old fence. There are support joist under the coop made out of 2x4 and the roof supports are 4x4. There are 3 in the back and 4 in the front. What do y'all think?