We use a shed kit as summer housing for our non-breeding hens. We creosoted the panels before assembly and cut wide slots at the top of the apex at each end and wired them over to prevent wild birds and rodents getting in but allow hot air to escape. We built it onto 2 x 4 inch skids with big bolts through them so we could tow it around the field. Works very well and was a third the price of a much smaller purpose-built coop. I just put a chunk of wood across one corner as a nest area and pegged in a piece of half-round rail as a perch.