Inspired by some wood being dumped at our house, we set about turning it into a functional car. This is not a "how to" video, because I wouldn't recommend anyone attempt something so unnecessarily elaborate, but it was great fun.
We did end up fitting an engine and brakes to it, but I never made a followup video for a couple of reasons. One is that the prototype was badly executed and I never had time to do it properly neither the brakes or the engine were geared right for the weight of it. Second problem is that if I published the video of Jensen driving it, I'd probably have child services at my door. It was not safe and he had absolutely no control over it.
2023 update: We now live near an amazing Kart track in France and Jensen is in his second year of karting school. When we left the USA, we gave the kart to Jensen's uncle who ended up dumping it in the street for someone to take. So if you're the person who now has it, give us a wave!