One Dix Designed epoxy/ply boat I know of was thinking of using exterior hardwood WBP ply over genuine ockume marine ply? the added weight was 500kgs! He chose to pay and save all that weight.
Supplier of Wooden Kit Boats,CNC design,epoxies,bronze nails,Meranti,Oregon,Oak,Beech,American,Teak,marine and exterior grade plywood,bending plywoods and Flexible veneer sheets,teak and holly flooring sheets. Agents for these and many other companies: North Sails,Harken,Lewmar,Ronstan,Raymarine,Yanmar,International Paints. See also our blog on cars,its another side of what we can do,try this link http://royckdboats.blogspot.com/