We built our second coop this last weekend. The chicks in the garage are ready to go outside and our first coop is at maximum capacity. I was able to get most of the lumber free by religiously looking on Craigs List for scrap lumber. Its 8' X 16' and we put the studs on 24" centers in stead of 16". The roof is corrugated tin and the windows are corrugated polycarbonate. It is a simple structure but I think our girls will be happy in it.