To accommodate the growing baby chickens, we are going to have to modify our coop and run. I want 1 flock, not 2 and I have plenty of space. What we have right now is ideal because the building was already there and we just used half for the coop and added the run. We need to do this soon as the other flock should start laying in about 10 weeks. We are "do it yourselfers" and try not spending a ton of money. I have to keep my Cornish separated from all of the chickens as they started bullying them and plucking their feathers til they bleed. So the Cornish stay in the backyard so they dont get hurt. During the day they co-exist and free-range. I tried bringing one of the younger ones out to introduce him to everyone but Goldie, my rooster wasnt having that. He grew taller and puffed up and out and started to tower over the little one, trying to peck his head, but I scooped him up before that happened. They need shelter at night as I have already lost my 2 ducks to a predator, most likely a fox. How large should the coop be for 17 birds? I know for sure there are 3 roosters so how many hen boxes? How big should their run be even though they all will eventually be in the yard during the day? What I would like to do is use the entire shed for the coop and double the run in width, extending it out lengthwise as well.