It's quite a large Stirling engine (machining required) sometimes called Great Laura in Germany, has adjustable speed hand wheel.
I think it is quite elegant, with possible exception of burner, kind of looks just added on to the wood board. It could be left off in build as only a smallish flame needed to run this big girl. The tank may look better polished.
These kits are quite spendy and shipping is high to but price includes VAT tax and you can get them to remove 20% if you live in USA, and ask.
https://youtu.be/aA-bPbhqeCU