We have 2 Buff Orpington 22 weeks girlies. We also have two 3 1/2 week Cochin chicks. We will be starting integration soon. I think I am going to build a mini square coop to set inside the run of our coop. My question is at night our big girls go upstairs inside to roost. What do I do with the chicks? Do I leave them inside their pen in the run and just make a roosting bar in there? Or do I take them back inside the garage in their brooder? Also I'm scared it will rain. We have a roof on the coop (its pre fab) but they could get wet from the wind. We just cleaned the coop floor and now it is all sand, so they will not be on wet/muddy soil anymore! Any suggestions welcomed!!!