: "Featherweight Boatbuilding". The basic plan is to use the forms
: given for strip building and use them as the cross sections (dimensions
: modified for the different lumber).

What is the seat location ( back of seat), the exact location of the 7 forms ?

This is a very short and fairly tall boat, so 4 cross sections should be
adequate.

The drawings I've seen show a rounded hull, so 3 X 1" chines per side would
allow you to approximate the shape, and would add considerable rigidity along
with a 1.5" gunwales allowing the use of as few as 4 cross sections with
thwarts , or thwarts at sections 2 and 3 with sections 1 and 4 being decked
along the first 15" and 16". An inwale could easily be added for additional
strength / rigidity and to compensate for the lack of a deckridge.

All depends on the spacing of the existing forms, though you could create new
cross sections at the exact locations required. I see section 3 just aft of
the seat ( at approximately 7ft ?) , and section 2 located at or just forward
of your footrest location ( approximately 4' forward of section 3 ). That
would allow you an open area ( no thwarts) where you are seated. A fifth cross
section could be used at the boats center, but I don't think it's required.

If you lash / epoxy all joints, strength and rigidity will be very good.
(see link below). The strip version isn't flexible, so the SOF version need
not be either. Weight for this SOF should be about 20 lbs.

Attached is a pic of a glued / pegged cedar frame with 3 X 1" chines per side,
1.5" gunwales, on a 17.5' Baidarka with 8 cross sections. This boat could
have easily handled 6 cross sections had the spacing worked out.

I'm making a few assumptions above, and assumptions are ALWAYS subject to change in the shop

Tom