I have 3 BOs and a silkie cockerel. All will be about 9 mos when I get my new chicks. Coop is 8x8, run is 8x16. We do minimal free ranging right now. I'm getting 4 new pullet chicks in April and plan to brood them in the coop in a 4ft dog kennel with a premier heating plate (the kind that heats over the top of them like a mama hen). I'd like to do the panic room integration method when it's tims by making a small opening into the dog kennel and also opening up an area underneath the coop that I don't think the big girls will be able to get into. My question is what age to start the integration? And how exactly? Short periods of time while I supervise? Close to bed time so the everyone is more chill? Any suggestions are welcome!