I have a coop that is about 6x3 feet, and it has 2 nest boxes, but I could add more if need be. The run is about four times that. So, how many standard sized laying chickens can I keep in there safely( I definately don't want them to be stressed out) Also, I plan to let them free-range occasionally when I'm home. Thanks so much for any help! P.S.- Can't wait for the chickies!