One might ask why only a few builders are taking on the task. The US military built a few fast attack speedboats all aluminum, I understand they are now turning to carbon fiber.

Forming aluminum to compound curves is a task too. Depending on the grade of aluminum being used, there is very little flex before fracture. For example, we test steel by bending it over a 3/4 inch radius mandrel. To bend the average aluminum, five inch radius. There are just better metals for the sea. It is kind of like the practice of building boats out of concrete, it can be done.

Stainless steel could actually be cheaper in the long run. Prettier too. Much easier to weld.