Aaaahhhh, jumping crying out dammit. Well a major colossal catastrophe has occured. Apparently all 'Marine' Teak Plywoods are not created equal. There are two distinct classes. Class one is a structural teak plywood made with a hardwood core available by special order only through one retail supplier. I am currently awaiting the lead times and pricing. The other type is not a marine grade at all but usually has a softwood core and a very thin teak veneer surface and is often marketed as 'decorative' marine plywood or simply A1 marine plywood. There is a huge difference in the compressive and shear load carrying capability of the two. So as my error becomes painfully obvious, grab an education at my expense, any true marine plywood will be stamped with BS1088 or have Lloyds certiication or it's pretty much good for nothing on a boat. Oh well as the saying goes, "I do it nice, 'cause I do it twice." Shrats.