I am a new to raising chickens and have been researching chicken coops. I would like to build a Chicken Tractor to house my future chickens. The more I research the more questions I have about building the coop and what size I will need. First let me give you all some of the details. Climate: Live in East Tennessee about 1.5 hours from Knoxville. I would consider our climate mild. However, We have had 100+ and below 0 degree Fahrenheit days. (thankfully not in the same day or that often) Chickens: 5 Orphingtons and 5 Australorps Yard: 1 acre open field (Used to be farm land) I thought about free ranging the chickens but due to the chickens size and slowness, this doesn't seem to be a good idea. When building the Coop, how much space do I need to allow for? If I attach a run to the coop, does that change the rules for how much space to allow inside the coop? I was thinking about building a Coop that was 4 feet wide, 5 feet deep, and 5 feet tall. With a run that was 4 feet wide and 10-12 ft long. However, I fear that the Coop height is too tall and not wide enough for the type of chickens I am getting. Ultimately, I want a good coop and run that will house my chickens comfortable, is easily portable, easy to clean, and doesn't cost me a fortune to build. I am open to suggestions or better ideas. The chicks come at the end of February/early march so time is ticking for me to get something together. EDIT: I just found this Chicken Tractor: https://www.backyardchickens.com/a/on-golden-coop. Depending on actual dimensions, something like this might work. I would want the height of the run at least 24 inches.