There hasn't been much talk of the tried and tested dinghy construction method of single skin fibreglass. This to me seems like a very viable alternative for mass production purposes, particularly compared with ply or cored composite construction. Home builders could also produce a single skin hull easier than a cored hull. Chined, semi-chined and compound curvature hulls can all be produced with single skin composite construction.

Admittedly it doesn't have the weight saving benefits of a cored composite, but this is only a small boat so significant weight savings are going to be hard to find with material changes alone.

Scarecrow, what is your basic hull surface area? (I haven't started a design yet.)