So I have a couple basses and a keyboard kicking around that I would really like cases for. I love building my own stuff and would love the challenge of making my own case. I was browsing the interwebs and found this instrucable on making a kayak out of laminated cardboard. Essentially, you just take a bunch of corrugated cardboard, run each layer perpendicular with the "grain", and put a LOT of glue between each layer... I was thinking of making a solid 6" thick box and cutting the shape out... obviously putting some kind of waterproof finish on it. Does this sound like a feasible idea? Or just folly?