Actually you can electroplate plastic fairly easily - all you need is some decent conductive paint - this stuff works really wellhttps://www.kemo-electronic.de/en/Components/Consumables/Soldering/L100-Conductive-Silver.php
see my post on electroplating printed parts from a while back - I wasn’t chroming, but I’m fairly sure you can Chrome a nickel plated part, although a mirror surface finish might be difficult.
After printing replacement arms for my glasses I got annoyed at continually printing replacements every time they broke. I’d seen it mentioned that plated parts are a lot stronger, and I figured it’s such a simple process that you shouldn’t need to use a service bureau.
I’m in the UK and initially I kept running into Spa plating and Caswell on google searches, but then I found http://www.gaterosplating.co.uk whose kits are very affordable. Just now I’ve also found http://www.frost.co.uk/autom…