RE: time for hinges
Forth Minnesotan!
I've used the CA hinges on both of the Goldberg Chippys I built, but they both had 4-strokes. I think I would still use them with a 15cc gasser, but you can't go wrong with robarts. Just be sure to use the robart Jig for drilling the holes - that makes it much easier.
Kork, did I meet you when I visited the Elk River field?
PS. OUTSTANDING airplane!