PJG
Building lapstrake canoes takes a skill level many times greater than what's required for ordinary S&G. I can't imagine anyone investing the time and effort it takes to build in lapstrake and then treating it like a rag in an "adventure race".
Aside from the emotional drawbacks lapstrake hulls aren't particularly light. A 16 footer goes about 52-54 lbs. if the builder knows what he's doing.
I think Looker wants an S&G hull that's as light as a Kevlar C-2 and there aren't any such animals.
The lightest S&G canoe I've run across is the 16 ft. Nice Canoe from Mertens-Goosen. It can be built at close to 40 lbs. in BS1088 but it's really a flat bottom pirogue intended for flat water and casual paddling.

http://www.boatplans-online.com/products.php?id=8

Charlie

: Why not a plywood lapstrake canoe? Very strong, light, and you can use many
: plans for strip-built boats; one of which should give you a good hull
: shape for speed. The construction is similar to multichine stitch and glue
: but instead of working from paper patterns for the plywood panels, you
: build a form like a stripper and lay wide strips of plywood over this,
: marking them to follow the lines of "ribbands" on the forms.
: These then are the pieces you join, right on top of the ribbands and
: forms, which ensure the hull stays straight during construction.

: Check the book Ultralight Boatbuilding by Thomas Hill for details on how he
: makes these.

:
: http://www.amazon.com/exec/obidos/tg/detail/-/0071567038/qid=1066801301/sr=8-1/ref=sr_8_1/002-5832986-9013668?v=glance&s=books&n=507846

: hope this helps

: PGJ