It will be very expensive. You can help by stripping off all (and I do mean ALL) the paint, and sanding the bare steel down to 600 grit before you turn it over to the platers. The better the prep, the better the shine. Traditionally, chrome is laid on top of copper and nickel. So any deficiencies are built right in.

You want perfect, do your part and give them a perfect frame to work with. Or be willing to pay the freight to have someone else care about your frame the way you do.