I am looking to build a small coop for my backyard to house 4 hens. What I have in mind is an overall footprint of 4x8', with an upstairs enclosed coop box that is roughly 4x3'. The hens will be let out to roam a a larger pen in my yard probably daily, and sometimes have free reign of my entire backyard. I wanted a coop/run large enough to keep them shut up if I leave town for the weekend. Do you guys think this size is appropriate? https://www.backyardchickens.com/a/building-a-4-season-tractor-rossetti-tractor https://www.backyardchickens.com/a/chickiemom1012s-chicken-coop https://www.backyardchickens.com/a/coloradomikes-colorado-chicken-coop http://www.horizonstructures.com/pull_it.asp This is a similar design to what I had in mind. https://www.backyardchickens.com/a/chickieberryfarms-chicken-coop-tractor I had also considered an A frame coop, it seemed to be really simple to design and construct. How does an A frame design compare to taller rectangle coop & run design? Is it easy to design an A frame coop with access to the upstairs portion for cleaning? Thanks for any advice.