Buddy T, I am by no means an expert...ok. But, from what I have learned, the coop is for roosting, sleeping and of course, pooping. They will all get along quite well for overnight. Yes, there will be the "pecking order" issue and others. But ya know what...you could have a 30' x 50' coop with 10 girls in it and there will still be issues. I have a 10' x 12' coop with 30 girls in it right now. Some are 2 yrs, 1 yr, 1/2 yr, 10 wks and younger. They are all fine...together.Don't over think this thing. My opinion only of course.. My money is on the area they spend the most time. THE RUN. if ya not able to free range them, build as big a run as your budget will bear. Thats where they spend most of their time. Good luck.
Erik
Erik