Got you covered Mark. I can also add a layer of Kevlar for weight reduction and toughness. Also, do you want some foam or 1/32" balsa as a core for floatation? I'll check to see if I have any .5mm rohacel. I know I have 1mm, but not sure about the 0.5mm. Can do carbon on hte outside, and Kevlar on hte inside as well. I think that 4 layers of CF cloth will be overkill.