If the rifle has a junked stock, crown damage, broken sight, etc I don’t see any issue cutting it down to something that might actually get used. Same with vintage cars. If it’s a survivor leave it, if it’s got issues or already been fudzed with go nut!
I have a old 30/40 Krag sporter and it’s a ball to shoot when I can find ammo at somewhat reasonable prices.
Just my $.02