Damien,
this is the laminate I was going to use. Note, I've left the core 50mm shy of the gunwales so you can add the flanges after curing and clear of the areas where chain plates would fit as I was going to do composite chain plates which work best on a solid skin. If you want those drawings I'll email them through.
If you infuse like I believe you planned, this laminate should result in a hull skin weight of about 11-12kg leaving you heaps of weight for decks, bulkheads etc. whatevber you do, don't let anyone talk you in to using 0/90 cloth (of any kind) as any fibres wrapped around the hull will be worthless and make no contribution to your stiffness.