Can anyone participate in this? This is the first mention of it I've seen.
FWIW
I say use whats in the box.
The builder can substitute circlips, rings, gaskets seals, carb (of same bore). Parts that increase durability, lesson the likelihood of failure, increase tune-ability..., can be substituted.
No part can be substituted that would provide an performance increase in performance over what was originally in the box.
You must use the supplied piston, cylinder, crank.
I would expect the builder to be able to port, cut squish and base.
To keep it so anyone can participate, no removable cylinder heads, stroked cranks and no expansion chamber exhaust. Or, a different class for those who wish to.