ERRJRDN
Chirping
I like your design, somewhat looks like mine, you can see my coop and my building of it by hitting the "My Coop" on my bio. I don't think you need to dig your predator perimeter down so deep, just make sure it goes out 2 feet all around the perimeter of your coop. And I didn't use any concrete for my coop, I built it and just set it on the ground, I believe that the weight of the wood is good enough to keep it in place. We get some good wind and rain storms here, and it hasn't budged since I placed it. And my door is on the side as well, but I am going to move it to the end so I can put gutters under the roof to control rain runoff better. Hope my tips are helpful.