Yes, Grumman also built the Lunar Landers for the Apollo missions. My point is that talking about materials and construction methods for different applications is pointless. You know one of the reasons for the shift away from riveted aircraft aluminum to composites in airplane construction is due to the fact that every hole drilled for a rivet on an aircraft skin is a potential weak point. In many cases where aircraft have experience problems with metal fatigue it almost always starts with hairline cracks at the rivets. That said, does this mean that riveting aluminum is a bad way to build a boat? No, it isn't, because the two vehicle operate under and in a totally different environment and method.