Can that receiver work on 3.7v? Most won't. I'm going to suggest that you build something from plans that a designer has worked out and experimented on to get the components right. Since you are doing this with a young one, it's important to be successful on the first try. I'll syggest a plane called the Blu Baby. It's bigger then what you were prepping for, but bigger is good for flying. The components won't cost much, and the flying characteristics are as gentle as they come.