I saw this a few days ago in Popular Science. I know... say what you will about the magazine. I still think it's pretty ingenious. I guess that's one way to build build a boat out of cardboard!

(Side Note: Since surfboards float on water and carry a person are they classified as boats?!)

Dan

"This surfboard’s frame is cut from 16.6 square feet of cardboard and covered in transparent fiberglass.... he used 3-D modeling software to design a snap-together deck that’s as sturdy as a conventional model and performs just as well, made from the cheapest material he could find: cardboard.

The board’s frame contains nearly 400 corrugated-paper slats precisely cut by a computer-controlled saw. The slats intersect at interlocking notches, forming a pattern of triangles and hexagons that provides strength by evenly dispersing force throughout the board. Sheldrake makes it watertight by wrapping it in fiberglass cloth hardened with epoxy resin (similar to traditional boards)."