I forget what they said at the USS Constitution last year....50%-75% original wood framing, the backbone of the ship (none of the rope or canvas to be sure!!!)
Still, stuff wears out, gets damaged and has to be replaced....yet to the correct shape/form/techniques
Replica, restoration, new build with used parts....gray lines
OTOH, new composite fuselage, plywood, car engine....certainly not a Bf109