I've recently just finished up building my first chicken "pen" or "coop". It's 8'x12' as of now. I'm getting 3 chickens later on today, but I was wondering how many chickens (max) I could keep in my pen? Here's some pics the first one isn't a picture of it complete, just during the process. Any help is appreciated. Also any advice about adding anything to my coop that would be helpful is appreciated thanks!