The rest of the 4X4's went up easy. I used a post level from Harbor Freight tools and aside from the slow digging it was relatively straight forward and an easy one man project. I did invest in an air nailer and small air compressor to make the rest of the project go a little easier.
This will be the chicken coop. The area that is open behind it will be wired in using 2X4 framing and the side wall of the barn for some safe outdoor recreation.