I'm thinking about building one like the PVC tractor in the coop photos. I'd like to keep separate flocks if we decide to get more sooner, I don't know though...my 3 girls get along so well, no noticeable pecking order to speak of, I'm afraid a larger flock would cause "issues" we don't have right now. And I want a Sebastopol goose...talk about ticking off the neighbors, lol.
BTW, the woman down the street from me has several (10+) chickens and a roo and she says she has no issues with even the roo because her neighbor is more than happy to take the bit of crowing in exchange for free pest control by her chickens. lol.