Hey, so I am trying to build a chicken tractor for my laying hens. It will be only a coop, no run because I want to be able to move then around and just put a temporary fence where they are going to be grazing. I have to many hens too make a coop and run, it would be huge. Never the less I am looking find something that can act as a roof, and cover the sides. I am looking for something light weight yet will last for a few years. Are there any suggestion? Also, I know this is really limiting but it needs to be cheap. Thanks!