I do the plating myself... it's a multi step process of de-rusting (pickling) copper plating then bright nickel...
Dunno what it would cost from a commercial shop... maybe $10 - $15 each if supplied in bulk... probably with a minimum order of $100 maybe for the work?
I've started stripping the large caps and cleaning the chasis up...1st 2 cans have been d/c'd and polished.. waiting for caps to replace...
Here I've started to remove chasis rust,... I may spot plate the areas with zinc to prevent future rust.. or I may mask the non-chasis components and spray with krylon nickel... dunno yet.
Here I've made new rubber bushings for the chasis mounts to the cabinet, from a sandpaper eraser/cleaner... they're about the same durometer and work great
John L.