I attached a 4 x 4 raised coop to the side of the main run for a brooder for baby chicks and broody hens.I still have to add a clean out door and a door to the main run(I'll save this part for last)I also have an old truck topper with windows I'm using as a grow out pen .The truck topper will be converted to a coop soon as they're old enough to roost.The only thing that separates thee main flock from the chicks is hardware cloth.They'll be able to see and hear them from day 1 so integration should be easier.They're the same breed too.