heres one I made up about 1 yr ago. It has an ajustable light stand, the top opens with an old window crank and the bottum is removable for ez cleaning. Since I frist built it I add a small door on the side.
I made this out of two cabinets. Yanked the back of of each and cobbled them together. Put 1/4" hardware cloth on one end and left the doors on the other (which I put a lock on the handles to keep predators and children from simply opening the door). The lower shelf goes all the way through (it is an old window I found in my garage attic). The upper shelf is only part-way and it is fun to guess which chick is going to firgure out how to get up there first! I'm pretty proud of it as I did it all myself to prove to hubby that he would not have to spend money on a brooder and that getting chickens would be easy and low-cost!