I'm with Brian on this. Re. endpours, many of clc kayak builders left out
endpours and replaced them with full-length sheer clamps. First longer than
required clamps are glued, then cut to a bevel at bow and stern using a
string streched from bow to stern as a reference with side panels spread to
required width with a stick. If you don't plan to hit things directly with
bow or stern I think sheer clamps will provide sufficient strength and
you'll save a lot of weight. My rowing shell doesn't have endpours.