I am BRAND SPANKIN' new to chickens. My awesome 17 yo son built me this chicken ark. He has been apprenticing as a plumber and insisted on making it out of PVC. It is working out great as a way to have the little chicks have some fresh air and grass time. Also helps to keep the stink down, as I can have them out of the brooder for the warm part of the day!! I based the dimensions on the fact that I have a small yard and it fits in my veggie garden areas which are very narrow. It is super lightweight. I figure that when the hens are full grown, I will be able to put 2-3 in there for the day. We are building a run and coop. If any of you want to send kudos to my son, I will share this thread with him. It would make him real proud!!