I love this idea and I think it would make a great chicken house build. BUT....what's going to happen when those floor pallets begin to deteriorate and sag?
The only through studs I see are in the door frame. The intermediate plate may help but I don’t think it can stop pallets stacked on edge from buckling under a roof load. Don’t lean anything against the wall inside or out. Maybe there’s no code there. It wouldn’t pass a structural inspection.