Has anyone every built their own? I currently have a Little Giant styrofoam bator thats still air. I've had some success with it, but recently I've wanted one a little bigger. But call me cheap, I can't afford an incubator that is hundreds of dollars. Even second hand ones that I have found, are out of my budget. So I am thinking of building my own, plus its more fun to me if you build your own stuff. Anyone have any pics of ones they've built, or any tips?