How about we make a lightweight copper hull shell, them resin the
inside with glass, etc. to make a boat that never requires antifoul?

If it was copper welded, it might need only very thin copper foil and
the cost played against other maintenance and advantages could be a
savings.

As I do not have any idea what this would cost to do I ask this forum
for knowledge, if there is any available? It's essentially a
substitute for gelcoat, no?

Terry K