I decided to go with a thick plywood on both sides since I built the nest box and will be adding a window to this side. I will also be siding the coop with some dog ear fence panels I found at Restore for $1.00 a piece. I bought all 58 boards in case I want to use any left over boards for other things. The bottom shows how I will be using the fence panels to try to make it look as much like my cabin as I can. They are not nailed on-I was just curious as to how it will look when finished.