Dirk Kramer specificed the laminate. I used one layer of 5oz carbon weave on the outside skin, 1/4 inch corecell foam core, 5oz on the inside skin. George and Steve's boats are Nomex core. Mine is glued together, Steve's is bolted, not sure about George's boat.
We added additional patches of carbon cloth at the shrouds, forestays, beam sockets and the outside skin that you stomp around on while trapezing. So far mine has held up great, I was out in 30knots plus 2 weeks ago and nothing broke.
