When I was in Sardinia I saw work being carried out on a boat next to ours in the yard. She had copper sheet on her hull
and it was stripped off to reveal very soft oak.
Once it had dried out, the remainder of copper nails were pulled, the holes sealed, extra screws were driven in on every plank at every rib
and the whole hull
was painted with an epoxy
. The widest gaps were caulked and it was left for weeks and then one day the guys turned up and started re covering with new copper sheet which was cut to the curvature of the waterline and nailed and sikaflexed in place.
I can only imagain the cost not only of the copper but also the labour.