A few weeks ago, I ordered ~20 chicks from Meyer. So, I needed someplace to put them when they came. I had used a cardboard box inside, but the little peepers drove my Yorkie nuts. He wanted to lay in the middle of them, he loves the chickens. So , anyway, at school, they had several crates and pallets come in when they redid the bleachers in the gym. I took them all home with me. I took one 4x4 pallet and added a layer of OSB to the bottom. I made 16" walls from 2x4 and put 1' wide pieces of OSB for the walls. I added 1" mesh netting (Chicken wire) from bottom to top around the sides. This leaves a 4" opening at the top of the wall for ventilation. Since it is 4x4, I thought that was too big an area for the chicks. I added another 1 foot wide piece of OSB to cut the space in half. When the chicks are 5-6 weeks old, I will take it down. Or put them on the bigger side and put more chicks on the other. For a top, I used another piece of OSB. It is hinged for easy access. I have a 2x4 across the middle at the top to attach my light for heating. I used pine shavings for litter. Pictures to follow.