Hey guys I've got 4, 3 week old chicks here. The girls seem just fine and happy in their little brooder, but I am assuming they will outgrow this setup before I can move them outside. At what point, do you guys think they will be too big for their baby brooder? I'd also like some ideas (or pics) of where to outfit them before they can safely go outside. We are in the process of building them a nice coop in the backyard 4ftx 6ft, but our temperatures here in Colorado are still below freezing at night. Any ideas are most welcome, and thanks in advance!