I think if I was in any way interested in a metal hull
that wasn't steel
or aluminium instead of stainless I would go with titanium. Sure it would be more expensive, but it would also last forever.
It would require a carbon mast
instead of aluminium, and titanium fittings, but at this point what's a few more bucks.
It was done at least once, and the University of New Orleans
is doing a lot of research
into friction welding titanium plate for the USN. So it may actually be getting close to practical.