I have 15 cochin chicks on the way and I was just wondering out of curiosity how big of a space they'll need. I have a brooder box that is about 4 1/2 feet long and 2 feet wide. It is also 2-3 feet tall. When they out grow that I have a puppy pen that I'm going to set up in my room for them. Then when they out grow that their going in with the big chickens. Is this a good plan?