Back when Brown's Plating was still in business, they did a tank for $375. Knee panel area only shiny, the rest dull. IIRC, copper first, nickel, then chrome. Excellent work and fast (1 week) turnaround. Wish they were still doing chrome.

Another plater quoted me $650 for the same job. Still waaay cheaper than Cycle Garden and doesn't involve cutting panels out and welding them back in like they do.
I've heard of stainless steel applique (very thin stainless steel sheet with adhesive backing) being used instead with good results. It's available online, used to make painted appliances look like more expensive stainless steel ones.