Lund twin-plates to midship because that is where the boat takes the greatest pounding. Twin-plating beyond midship adds unnecessary extra weight that will decrease performance. It also adds significant extra cost for a feature you absolutely do not want. There are fastening methods equal to riveting. If there were alternative methods, airplanes would utilize them.
Rivets remain the most reliable fastening method known.
There are boat-building materials equal to aluminum. Lund uses aluminum because it is lighter and more durable than other materials. Aluminum is also more economical, and it requires less maintenance. Additionally, we were among the early pioneers of aluminum utilization, and we continue to lead the industry in maximizing its effectiveness. Poured foam flotation in the hull cavity allows us to exceed Coast Guard requirements and quiet the ride.