Wow!! How exciting. That's a lot of chicks! How big is your brooder and where will they be? I plan on having them in the house 2weeks then garage til it's nice out to go in coop. Right now I have a box that is 2 1/2 X 4 1/2 that should be good for a week or 2 then getting giant boxes from Costco and taping two together. They are about 4x4 each. And I have baby gates to lay on top. My DH offered to build something but he's still building the run and there's so much to do yet I don't want him to get distracted!