Jeff,
So do either of these inner door colors (silver or red) look appropriate?
No - not exactly and we're all about being exact as possible here
The inner area would have had a sharp masked/taped edge between the two colors. Of course some may not car since its not seen on a finished car
The edge at the bottom is not typical IMHO but more like we see on "restored" cars and doesn't replicate 66-66 NJ doors.
This example was offered up a while back from one of our members
The car had a exterior repaint with the door jambs done with weatherstrip left in place. Though they did repaint the bottom of the door it appears that they masked along the original line as evident by the rear edge where they didn't repaint
Inner paint edge
Top rear upper edge
Forward front surface
Bottom edge/surface