I am new to boatbuilding, so I don't know a ton about boat stuff. I am building a Weekender, I have purchased the 1/2" and 3/8" plywood. It is voidless and uses water resistant glue. the guy at the plywood shop builds boats too, he said it would work just fine after fiberglass and epoxy. He said he wouldn't leave any exterior surfaces un-epoxied (which I planed on doing anyways) Now on to the 1/4" plywood.
He didn't have anything that was more than the 3 ply stuff with the inner core that looks like the luan stuff. He recomended 1/4" underlayment at Home Depot. My biggest concern is it seems flimsy. One thing I thought of is not using plywood for the sides but stretching fiberglass planking like C-Flex and epoxying that, builing it up to 1/4" and calling it a day.
To have 1/4" marine plywood shipped to my door would cost $300, a bit much! So any thoughts? concerns?