Duster Rear-Defroster/Defogger?

I never got around to it, but I thought about a DIY grid-type defogger that would be more like the factory type than the aftermarket stick-on types. I'd mask the interior of the glass (inside-up on a suitable workbench), draw the lines and bus bars on the mask and cut them out very carefully to make a neat job of it with consistent line width, etc. Then I'd apply glass etchant and let it work, wash away the etchant and let the glass dry, apply however many coats the conductive paint that makes up the actual defogger lines, probably with a brayer/rubber roller for consistent thickness, let it dry, remove the masking, and apply terminals with suitable conductive epoxy.

The control circuit would be easy from whatever OE parts bin I cared to raid: momentary-contact switch to trip a 10-minute timer relay. Or if I didn't like any of the OE options, Amperite makes a variety of timer relays that could be put to use.

Back to the question at hand: when I search [1976 Plymouth Duster] [Glass, Back] [2dr, heated] on www.car-part.com , I get some hits including some "New OE" ones in New Jersey. Search results on www.hollanderparts.com might show up, too.