I don't know Cy
I'm still thinking about buying a sheet of 3/4 Seaboard Grip X. The stuff is $337 for a 5x8 sheet. I can use half for the gas tank cover, a piece for the small deck lid in front on the tank and maybe use some for a pulpit and other odds and ends. I'm just not sure that it is structurally strong enough to span the opening without some kind of support.