These would be human powered if you pushed them up the hill, right?
My dad was always talking about how they used to do this a lot when he was a kid, ya know, before video games. Looks like fun, I might have to build one. According to a guy on another forum that knows these guys, you're basically guaranteed to come in DFL for a long, long time if you try and race with this group. Apparently they've mastered the art of building and racing these machines.