Netters, Dan Rhin's One Design plans call for Ocoume marine plywood! I've worked with this plywood for nearly 20 years and it is wonderful material to work with, although it does tend to dull your saw blades, etc., a little quicker than other types of plywood.
I currently have about 6 sheets of 1/8" Ocoume and a couple of sheets of 1/16" Ocoume sitting in my shop waiting to be turned into Cygnet wings! These panels are British certified and came frome Edensaw Woods in Port Townsend, WA at 1/2 the price ACS lists it for. (Justin: try Spar lumber in Long beach). Regards, Tracy O'Brien