Here's a 930 that my friend cleaned up for me some years ago. The paint wasn't too bad but we did redo the typical areas that get sandblasted on a 930, along with the wheels.
The leather in the interior had been refinished multiple times (quite poorly, I'll add) and he was able to remove all of that shoddy work. The original leather color underneath was surprisingly pristine, as you can see in the photos. That's all original color, not touched up. No idea what suggested to a previous (idiot) owner that it needed to be refinished.
Lots can be done to sympathetically refresh a car if the shop knows what they are doing.
https://forums.pelicanparts.com/porsche-cars-sale/496173-1980-euro-930-sale-low-miles-unmodified.html