On Sun, 3 Dec 2006 12:15:10 -0700, "Bob La Londe"
wrote:

I am asking about all fiberglass composite construction, and if there are
reasonable options for the backyard builder.

Closed cell structural foam as a core material for the hull and
stringers, solid fiberglass in high stress areas such as the transom.

http://www.boatdesign.net/forums/showthread.php?t=221

http://www.atlcomposites.com