I grabbed a motor off a 77-ish Cordoba.
That's a bolt on upgrade.
Mounts right where the handle attaches and is covered by the headliner.
The switch was toast, but looked very generic (rocker from radioshack will work).
I'd like a glass insert, as well.
I thought about cutting out the center and finding a similarly sized glass roof for donor glass.
That would keep the mechanism intact.
Having a pull closed shade would be nice, and almost a necessity in FL.
Then I also decided not to deface the factory stuff as it's kinda hard to find.
I'm 6'3 with a long spine, and the headroom lost to the s/r causes me not to fit, even after I remove the seat track spacers.
Right now the plan is to find an aftermarket, glass "flip-up" s/r that fits the factory hole, and just remove the mechanism and use the aftermarket s/r.
That way I get my headroom back, and don't tear up the OEM stuff.
There's a school of thought that says virtually all OEM s/r installs were done either by the same company, or by one of two companies. I can't say I completely agree with that, as I've seen way too may variations on the assemblies that suggest they were not all done "by the same hand".
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...in fact the Cordoba s/r motor looks very similar to later model p/w motors (flats on sides of motor making it slimmer).