Thanks for starting this thread! Great opportunity for another newbie to jump in for the first time! I'm just about to get started on a C15. Wanting a lightweight tandem, it seemed the best choice for a fairly new builder (one plywood pirogue) with a wife inclined toward stability. But I'm here on the board because I'm a fan of Jeff's book, and there seem to be a lot of good ideas that apply to either Dave or Jeff's designs. Will there be more builds in the future? Hope so...Jeff, if you ever do go with a tandem, I'd sure be interested.