The kevlar is definitely worthwhile. I've handled my boat clumsily, dropping it off the trailer for instance, without serious damage. The internal downhaul is a clean and efficient add on.
One issue about Kevlar...it's harder to repair since is doesn't like to be sanded. If you hit rocks that damage the hulls, even Kevlar will need repairing.
Does the F16 float & support crew if both hulls swamped? (That's a class rule for Tornado).
