This one looked pretty straightforward...
http://thehomesteadingboards.com/pallet-chicken-coop/I would forgo insulating with straw myself...And probably strip the boards off the backside of the pallets.
The bolded aren't really needed. Nice, but not needed. the pallets on the other side of the hoop can be used for walls, as they have vertical boards, not blocks.
Take a sawzall and saw the slats off the back side of the boards. Take the slats and use them to cover the gaps.
People make...