I'm going to make my forms for my kayak tonight. I'll be using 3/4" 11 ply guatambu plywood. I have some reservations about using a 2 x 4 for the strongback though. Framing lumber that we get in this area is really crummy. You can hand pick it in the lumber yard and it looks nice and straight. But after you take it in your shop and it continues drying, it can wind or curl considerably.

I've considered laminating up a 2 x 4 beam out of kiln dried oak. And, I've looked at making the ladder type strongback as shown in Nick Schades book.

I'd like to hear many opinions in order to assist me in making a choice.

Thanks,

John