Thanks Åke (and Stewart). I understand that your opinion is that except for scuff resistance a catamaran strip hull will not gain much in the way of strength by using 200gsm instead of 100gsm. Correct?
I was worried that panel stiffness and strength would not be good enough for loads working 90degs on the wood fibers, making the glass strands break with catastrophic hull failure as a result. We dont plan to put much inside the hulls. Just partial bulkheads/ring-frames under the beams and at the bridle, going for a monocoque structure. This means that the panels between the bridle and the mainbeam will have to take care of themselves.

BTW, Åke. Just had a look at the pixie building photos you have on your site. I must say that your workshop is really nice and inspirational with its position just by the water. Looks like an old boathouse? If you work with epoxy during winter, how do you heat it?