i have been shopping for plywood for my build, Matunuck. i will be painting mine so the skin of the plywood doesn't have to be nice. the place i usually use has BS1088 Okoume and Hydrotek. the only thing is they say it is 1/8" and 1/4". using a calculator and seeing posts here, 1/4" = 6mm, 3/16" = 4mm, and 1/8" 3mm. the plans call for 4mm. would it be a bad thing to use 3mm plywood on my Matunuck? what kind of strength difference is there? is the real strength from the fiberglass/epoxy? i live in SF bay area and shipping from MD is not cheap. should i search more and find 4mm or will 3mm work fine?