I am not so sure about the claim to be the smallest- Eric Whittle brought a V8 air cooled engine several years ago and that was pretty small. It was written up in the UK magazine, but I cant put my hands on it right now to see its displacement.
Regardless of claims of smallest it is still a fine piece of work.
I just looked back through this topic and see that the fellow I had a nice chat with was Art K, of Madison WI. We were back to back on our tables and until now I did not realize it was someone on this forum. We need hats, or big buttons next year to identify us a forum readers.