Not my bike so my opinion is just my opinion, but if I were planning on riding it, I'd repaint it, and if I were hanging it on the wall, I'd leave as is. I've never fully understood why paint isn't viewed as a consumable / renewable component of a bike. It wears out like everything else, and fundamentally, it's there to do the job of protecting the tubes from corrosion. I do understand the appeal of patina (I own a few old guitars and a very tatty VW bus), but IMHO in the end it's an aesthetic choice. Good luck with the project. It's a journey!