The channel is pretty impressive. He built a 3-cylinder internal compression engine completely out of Legos (well...plus an empty plastic bottle as the air tank). Yesterday I watched him build a train for his cats to ride in. He said it took him 2 years to do it, with no guarantee the cats were even going to cooperate. He even built a compressed air car coupler system, again with all Lego parts, the 3D printed track and wheels.