Has anyone used a plastic children's pool as a brooder. I've seen/read that it works just fine, but would any of you recommend AGAINST it?
Depends on how tall it is. They start jumping pretty high at a young age. Maybe if it had some kind of top on it?!
We were planning on putting hardware mesh around the sides to create a wall around it. I guess I'm mostly concerned about the heat lamp being too much for it, since the material isn't as "durable" as a Rubbermaid tote or something like that.
Yes you need to make it taller.. YES the heat lamp CAN AND WILL melt the pool, I have melted my rubbermaid tote !!! Well, my DD did !!

My only warning is the bottom of the pool is slippery....that can cause splay leg. Make sure you line the bottom with non slip material, not newspaper..that is slippery.