I have a really well built 10x12 building that I built over 20 years ago, that just doesn't have much use these days. I figured it would make a nice coop with a few upgrades like some windows and divide the supply room/egg retrieval area from the coop. I am adding on a small covered run of 8x12. I will add a larger unroofed area for them to have some space to scratch and peek later. I was concerned with putting the windows above the roosting area, but it is the best place to maximize cross flow of air. I will start framing the interior wall between the storage area and the coop tomorrow and build my nest boxes too. The I will begin to tear off the old siding and frame up the space for the door and the window on the front of the shed. Then tear off the siding in the back and frame up for the two windows at the back of the coop. Got most all of my lumber here so I just have to get my air nailers oiled and ready to work. Any suggestions of what i might not have considered would be appreciated.