RE: GB Extra 300
Thats why I left the lightning hole in place ,it adds a ton of strength to that area W/O adding alot of weight. Goes from a 1 inch unsupported piece of 1/8" lite ply to a almost 5 inch piece of 1/8" lite ply, which I don't think is going to break off very easy. If i'm overlooking something here let me know, cause I don't see it honest.
It ties in good at both the top and bottom so side strength isn't a prob or shouldn't be.