I had heard a lot of bad stories about meranti ply in the US websites but I found the marine ply here to be of good quality. I went through several sheets when I built my canoe and there were no voids and good veneers used. Only thing is that the thinnest I could get was just under 4mm thick....and I dont think meranti ply bends as well as okuoume.
Why meranti? Few good experiences with meranti in high stress applications where you want low weight, as far as I know. 3.6mm is less than 4mm, so that further reduces strength. Are you planning on glassing the boat inside and out (adds weight)?
