Im thinking of building a small pushboat to retreive my speed boats. I dont want to get to fancy with it, but I was wondering if there is an steam engine that would be suitable for a pushboat about 20" long? I never built or had a scale boat so Im in the dark with this. But after looking at some videos on you tube, I thought it might be pretty cool to do something like that. How much am I looking to spend on something like this and is it even woth it? Thanks