I have built one of these some time ago, but the video is not mine. I still need to make a YouTube account.
The engine is a bit of challenge, not because of complex build but dealing with wood and warp and it is "dowel" togather with round toothpicks. I painted mine vintage blue because I did not care for the burn color edges from laser cut, and did not want to sand away all the burn. What got me thinking about the model is I am currently collecting parts to run my steam engines on a compressed air tank so I don't have to listen to a compressor and can enjoy just the mechanical engine noises. The Model was designed to run by blowing up a balloon and the gentleman in video demonstrates this near end of video. I have some build tips if anyone wants to try this model, in fact I may build an improved one. These can sometimes be found on eBay below retail as people purchase and then perhaps overwhelmed by the # of parts or perhaps a child was not interested. The largest issue is the piston to bore fit has a lot of clearance and some of the toothpicks are warped. I purchased a box of premium toothpicks and spin them between my fingers and select only the straightest ones, this plus lube all moving parts with #2 pencil lead Greatly improved performance. Also valve timing set correctly is very important. Thought I would share.