Have you ever made a stitch-and-glue boat with your lay-up method? If so, what did it weigh? I've been toying with the idea of making a light hard-chine s-n-g with 3mm okoume and something approximating your lay-up. Obviously 3mm okoume will be a bit heavier than 1/8" cedar or redwood strips. I built an Arctic Tern with 4mm okoume and a standard 6-oz. lay-up, and it weighs 37#. I think I could get under 30# with the above material changes.

One difference that would be tough to quantify, though, has to do with the flex in flat panels as opposed to the inherent stiffness of a curved panel...

Dean