Thank you!! More important than giving numbers, explaining the logic is very helpful for me. One problem though: how would one go about making forms at those locations where they are not listed in the diagram and without offset tables available?

: Using the existing 2', 4', 6', and 13' cross sections would probably work
: without any changes, but I'd opt for cross sections at ~9' and ~11'. The
: "9'" cross section would support the back of the coaming, and
: "11'" would just be half way between 9 and 13... No need for a
: rib in the middle of the cockpit. You won't need the cross section at 1',
: that end of the keel and chines will tie into the front stem peice. You
: could probably get away with leaving 13 out, but it would help keep the
: chine in place since its placement is extreme.

: Keep in mind the extra chine on the bottom of the gunwale - following the
: lines shown in the drawing will twist the gunwales away from where they
: should be.

: I'm also very tempted to try building the F1 in the "yost" style.
: If it lives up to half the hype, it should be a great kayak.