A bit of info here on chrome plating.
http://www.ellisbriggscycles.co.uk/chrome-plating-on-vintage-and-classic-bikes/
Some prices here as an example.
http://www.bobjacksoncycles.co.uk/reno_chrome.htm
I once had a whole track frame chromed by an industrial chrome outfit, it was ok but not up to the standard of the ones in the Ellis Briggs link. and I didn't know at the time the warning about chroming certain tube sets, so I would choose a cycle frame renovator if I was to chrome again.
I have had a frame finished by Ellis Briggs, and was very satisfied, but there was no chroming applied.