Honestly, I've never been a "This many square feet per chicken" person. I watch my birds. If they seem content, aren't fighting, feather picking or showing other signs of being crowded, I know we're good. That yours free range will be helpful, but if you get a bunch of cockerels you may need to separate them from the girls as they get to breeding age. A couple of years ago, I had 50 straight-run chicks running around (I hatched half and ordered half of them). It was all good and well until the cockerels (about 25 of them) reached their sexual maturity and did not leave those poor pullets alone. They chased, they harassed, they gang-bred them. So, I put all the young males in a "bachelor pad" (or, as I called it - a finishing pen), fed them out and we butchered them all. There were some BEAUTIFUL roosters in that pen, and I would love to have kept a few, but they were not right for my flock, so away they went. If you go this route, you should know that a DP rooster, or one of a laying breed will not be as meaty or have as nice a carcass as meat bird. But they will taste delicious!