Took some time trying to find the best place to buy local materials and found Boulter Plywood in Massachusetts https://www.boulterplywood.com/. Chris at Boulter Plywood had just received an order of aircraft quality Sitka Spruce material for ship masts. Originally I was only going to buy the minimum amount of Spruce but I decided to buy all the spruce he had. The Okoume plywood came bound in 1/2 inch A/A quality birch and 1/4 inch ply.