In '01-'02 I helped a friend build a 39' custom sailboat (with numerous other volunteers)- he designed it himself (high tech stuff). After 10 years, he put it back in the barn for a year and redid it. Refinish, correct mistakes from original build, upgrade systems, etc. Boat is better than new.
I have a partial list for my personal redo, but I can't find a shop to take on the work. Maybe if I live long enough... But then I'd have to go back to work to pay for it.....Naaah.