I have a shipment of baby layers coming in in the next couple of days, and have a fine assortment of brooder materials at hand. Initially, I think I'm going to just keep them in a large plastic bin with hardware cloth over the top, with the necessary heating and substrate, of course. They'll be in the basement, which is finished and heated. After they outgrow that, however...is there any reason not to just construct a cardboard pen in the basement with a tarp for the bottom, and spread pine shavings over the tarp? Then I could just gather the tarp edges into a giant sack to be carried out to the compost pile. Would the cardboard stand up to twenty inquisitive chicks, as they grow and feather out? Would they pick at the tarp too much? Advice please? And thanks so much in advance!