Looks like a lot of rough cast parts, and just machining for finished fitment. I like the concept but can see where it would be pretty expensive. I would have done a v6, or v8 version with a displacement of 40 to 50 cc. With the advantage of larger pistons, rods and crank shaft it would have been a less complicated engine, that would have been easier to work on. I really like the idea, but to mass produce and get people to buy it, it needs to have some sort of practical use, besides sitting on a stand for display. (More or less a conaly engine as they are pretty gutless for displacement) what would your price be for a kit to assemble the latest engine?