I was working on this till 4 am. It is an extension of a (run 16 sq ft) for bad weather/predator issues/free ranging is an issue. It is for 4 chickens. This would make the total 56 sq ft (10x4+4x4). Though It will probably be 2 ft shorter on the left for the side portion on the drawing. It's 12x4 on the drawing. I am thinking of building this with pvc pipe /greenhouse roofing (clear pvc wave material/plastic underneath to rain proof) I am getting a ark coop. There will be a door that rest on the slanted roof section. It could also be used as a stand alone run with the back doors on hinges. The measurements need to be tweaked but I am happy with it.