It may not be exactly the boat you want, but Mechanix Illustrated How-to-do-it Encyclopedia Volume 3 has a kayak. This book was published in 1961 and may be available on the used book market.

The kayak in this book is called the "Canvasback" and is a skin-on-frame design with plywood forms and covered with canvas.

: My husband's birthday is coming up and I am looking for a pattern to a kayak
: we recently saw. We talked to the people who had them, and they said they
: were made in the 70's by a high school shop teacher and they thought the
: pattern came from POPULAR MECHANICS. I have been searching and searching
: everywhere I can think of and have been unable to find anything. Perhaps
: somebody has a copy of this or can tell me where I can get one quickly!

: The kayak is made out of one sheet of plywood and is collapsible. The gussets
: (I think that is what they are called) are held in place by pressure and
: the sides have some sort of taping or fabric stripping around them to make
: it flexible, enabling them to fold flat.

: If anyone can help me, please respond to my email, bubba41437@hotmail.com

: Thanks!