I have finally finished my first coop. And I'm very excited to start choosing my first group of lady's to live in it. I have a few questions... 1. How many hens will live comfortably in a 8x6(just coop) that has I ceiling that hits 6ft.(has separate roaming yard as well). 2. Does the separate yard have to have fencing on top to prevent flying? 3.which breeds should I look at for the weather extremes of Arizona. Hens just for eggs not meat.