BeefQuesoritto
Songster
Pretty similar to my coop.A calf hutch attached to a floor of 2x4x8s. A power drill and some bolts to attach hardware cloth over the openings. The bonus is that you can staple clear plastic over the openings in the winter and they still have good light during the day.
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Mine's just a metal shed I cut holes in with an angle grinder. Could probably do the holes with tin snips if masochistic enough. The angle grinder was super easy, though. No handiness needed.