I have only laid out the plans for my backyard coop which includes chunnels... haven't built it yet nor do I have any hens yet...I want to ensure everything is ready first & that I've done all my homework. Chickens only recently became allowable in my city. .. and there's a sunset clause in the approval, so I'm gathering info & trying to get a small flock (I'm thinking 4 hens) established in the next couple of months.