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Vacuum deposition really brings back memories. Haven't heard or read those words in years. Back in the early 80's I developed a procedure to vacuum deposit pure aluminum on PMMA (ie, acrylic) discs then spin coat them with a clear lacquer that was cured with UV light. The finished product was commonly referred to as a VLP or video disc. Shortly after that, we developed a similar procedure to coat smaller discs (ie CDs). Yeah, some fond memories.
Now, back to our previous discussion. Sorry for the interruption.

spectrachrome.com/

It is literally spray on elemental silver with a clear coat. Long term out door use is not so good if it gets scratched it will tarnish just like a silver teapot. If you keep it dry and out of the sun its great.

www.vacuumplaters.com/

Vacuum deposition of vaporized metal might be the best option. Not sure what it costs or what can be done. Would love to learn more about this process.

Not sure a regular plating shop could do much with plastic. You might look into places that do hydro-dipping or this...

Check with these guys, I'm not sure about plastic but it couldn't hurt to ask. I know I see them at the local car shows here in WI.

customplatingspecialist.com/index.html

Does anyone know how to redo the plastic chrome on the Lark door