Wow!! That's going to be NICE! I built a small (50x50") coop from pallets and pallet wood (which should be called iron wood because it's so hard...lol). I kind of wanted to try a large coop/shed, but didn't have an excuse to at the time. Maybe I need more chickens to give me that excuse...lol. Looking forward to progress up-dates!
I built this coop out of Sheet metal pallets that ranged from 10ft to 14ft. I used the slats for siding. The shingles are leftover from family and friends. I only had to purchase 2 12ft 2 x4 and the chicken wire. I used everything else from what i had laying around the house.
Man, it would be so easy to insulate a pallet construction coop! I hadn't really thought about it until I saw the walls of your construction but I can see the possibilities like crazy! Are you insulating this structure?