Some people use PVC tractors or hoop pens. Try searching meat bird housing or cornish cross housing, something like that. We just built a triangle-shaped coop (two walls and a roof, with a wire front wall and big vents on top, air flow is very important) in the corner of our layer flock's run and fenced off a portion of it. However, we only had 11 birds and they pooped so much we had to put them on grass in a pen made from cattle panels during the day so they would not get blisters and burns on their breasts and feet. It also kept them much cleaner, and since I moved them back and forth by carrying their feeder in front of them, they got exercise. I think it made for healthier birds. If you do not put them on grss int he shade, I would reccommend putting a tarp over their run to shade it, they are very sensitive to heat. Also, the cleaner you keep it, the better. I would reccommend sand in the run so you could rake the poo once a week. Clean their house/shelter once a week at least.
For brooding, anything will work based on the number of chicks you have. A 2'X3' shipping crate works for us for 11 birds until 3-4 weeks, then they have to be moved to a larger pen in the barn. Once they don't need the light they go to the coop I mentioned.