I'm finally building my coop and run -- I'm really excited. I want to have 5-6 chickens -- how many square feet do the coop and run need to be to accomodate that many chickens? I thought I read somewhere that the coop needs to be about 4 square feet per chicken -- does that sound right? Don't want the chickens to get all "cooped up." So for 5-6 chickens, I need at least 20-24 square feet of space, is that right? Does the same rule of thumb apply to the run -- about 4 square feet of space for them to run around? Thank you!