I have not done it myself but I know a restorer that uses the reproduction vent frames. He says that chrome an detail is pretty good and the cost was less than replating.
As a measuring stick, NPD price on each quarter window assy. is $447 each with new glass, ready to install (if date coded glass were not important). Each vent frame, (no glass) is $166 each. I would hope that order hits the FREE shipping mark for the 4.
Are we saying a chrome shop will exceed this, once you add in other costs of buffing/polishing the stainless strip, installing NOS weatherstripping (I already have all 4, front & rear) and any other rollers/rivets required for assembly (these items I still may need)?
Fronts vent frames, perhaps a reasonable alternative but the rear quarter frames, I'm not so convinced yet. I need a quote, I imagine that I need to know what would be expected by a plater (how stripped down the chromed section needs to be) and how much they would estimate on each part to sort this out. Fortunately, this is only the "planning stage" on whatever path I choose. I do want the chrome perfect, stainless shouldn't be an issue having it polished, that and any minor scratches in the glass that I have noticed.