I do similar for a week or two post brooder but use at most to chicken tractors. Tractors used for acclimation to conditions beyond brooder and promote imprinting on ground roosting location. After first week the chicken tractor simply becomes a coop I close up at night. The chicken tractor part of operation makes so I can spread groups out by the time they are allowed to free range. If all goes well the broods do not overlap where they forage promoting longer quality forage. If they are together too much forage gets clobbered and older brood will drive younger from feeders and loafing areas. My setup as described for Dominiques with only a few games mixed in. Majority of games hen raised and I use their pens likes chicken tractors while hens in lay. Once hen commits to incubating pen set in that location through point chicks are about five weeks old. The moving of pens helps me disperse broody hens. Chick survival is much better when hens can keep broods spread out. Chicks not outright killed by hen-hen conflicts but disease seems to take out stressed broods much more frequently. Those same tractor-pens help keep GHO's from snatching chicks off roost.
