I am getting 15 chicks late next week. I have three boxes to use for brooding them. Two are 3x5 and one is 2x4. I am getting 5 layers and 10 broilers. I was thinking of putting the layers in the 2x4 and 5 each of the broilers in the 3x5s. The layers would be going to a bigger area when they outgrow the box, but the broilers would stay in the boxes the whole time (with excursions to the outside every day). Does that sound reasonable or should I change things around?