We had my whole dash done on a 66 gmc, (chrome tech usa) the only problem with plating plastic is that the chrome seems to be very soft.....but it looks great.....I have been very careful about cleaning the dash nothing abrasive.
stock:
http://kieth.smugmug.com/Trucks/66-GMC/i-PBfZXjT
after plating: cost about $200.00
http://kieth.smugmug.com/Trucks/66-GMC/i-WG7WWFv
All chrome was too much so we painted the flat part crinkle black, thought the contrast looked better.
http://kieth.smugmug.com/Trucks/66-GMC/i-X8WmmMg