Aloha! Since I live in Hawaii where it is always warm (up the mountain where occasionally it goes down to 55 degrees at the lowest) I was told we don't actually need a full coop. So I decided since our property has an enclosed chain link "square" I believe it's 30x20 but will have to clear the brush to get exact measurements . But it's huge and just sitting there and would be perfect for my soon to be coming chickens. I thought I could cover it with hardware cloth, put in perches and nesting boxes. What should I do with the top? It's walls are about 6ft tall. Tarp? Netting? Anyone have similar runs I could see for ideas?