I have an 8' x 8' toolshed that I turned into a coop and I need to add a run to it, but have no idea how to begin! This is what I envision: The run will be about 7 feet tall to accomodate a full-size screen door. I'd like my girls to have PLENTY of room to roam, so ideally the the dimensions would be around 20' x 20' and 7' tall to accomodate a full-sized screen door. This way I can easily walk in and take care of cleaning, watering, etc. in the run. The only problem I forsee is that the run would be built on a slight slope. The ground is not level. If someone has built a similar run, could you post back detailed instructions please? I have no clue where to start to build it or what materials I need. Thank you so much!