We are getting 6 pullets in June (don't have the space at the moment to raise them from chick). My brother is helping build our coop. I was planning on using the Coops for a cause 4X6 as our inspiration for our coop. My question is for the run. Given the 10sq ft per chicken I was planning on 60sq ft. Can I use the space under the coop as part of that 60? This way I can make the run either 4X9 or 6X6.