Here is one of my C5's, I was fortunate enough to get this for £125 complete with all original documentation and receipt.
Basically all I have done is replaced the gearbox as the drive shaft was very badly worn on the old one, and scrubbed it a couple of times as it was stored in a barn for many years but as you can see its scrubbed up quite well.
Cosmetically I think all I will do is replace the reflective strips
I am going to turn up a bush to repair the original gearbox as I need it for the the rebuild of the second one