Yes, GT, for at least 60 or so years they have been plating anything solid that will withstand a trip through a high vacuum.
There are two processes, It is possible that both are called "Sputtering", One, where the metal is deposited from a small arc using electrodes of the plating material. And in the other method the metal is deposited by explosive decomposition of the metal by blowing a small fuse of the material with a high voltage electrical current.
Similar processes plate many parts of our Spacecraft.
I believe that the metallic coated parts of model kits are treated in a similar fashion.
Viggo
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