Insane timeline indeed! I wish I had a work ethic like that. It's interesting how he tells that as a child, he was encouraged by his parents to "always finish his project, no matter how much you disliked it".
I wonder what the reliability of this beast is like, but I guess only time will tell.
If anyone is interested in this kind of stuff (fiberglassing fuselages, building cockpits...), Peter Sripol, a model plane enthusiast, made his own DIY plane that can carry a human with hobby grade brushless motors: https://www.youtube.com/watch?v=eNSN6qet1kE