We have two very large pens out of pvc pipe and zip ties with heavy tarps over the tops. We like it because you can make any shape you want out of it. Both of ours have peaked roofs and several 'doors'. They are semi-mobile and we move them periodically. We don't have a large predator problem, no neighbors, and everybody is locked up tight at night, so it works well for us. So far, our biggest problem was that we had 80 mph straight line winds and one of the pens picked up and moved about a foot from the coop, even though it was attached, no match for the storm, was like a giant box kite...so now it is belted on with ratcheted tie downs.
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