Steph,
If you however you come up with some great idea on how to do it please let me know also.
Thanks,
Bob
Well, I haven't designed a mechanism yet, but how about this as a concept:
The top 1/4 of the window is a fixed panel of clear plastic/acrylic, that reduces the height of the lower window so that it might be able to be retracted fully into the door.
As I see it, the issues involve need for something to retract adequately that toll booths would not be an acrobatic exercise, and if that window could retract fully into the door that would also allow for a fellow to look smart with his arm out the window, resting comfortably on the top of the door, as he motored along. Perhaps water entry issues could be addressed by "eyebrows" such as I have seen on the spider where the top of the doors fit.
I do recall that Subaru, thought it was the STX but that didn't pan out when I did a Google image search.....but IIRC the plastic upper part of the window on that Subaru was sort of hockey-stick shaped, with the "handle" coming up the front of the window frame and the "blade" at the upper margins of the window opening.....that reduced not only the height of the glass, but the length, too....might be a way of dealing with that interference with the mirrors when they are mounted to the front of the door.
Sure wish I could remember that Subaru model, it was a swoopy, low-slung sports car, not exactly my cup of tea but IIRC it did perform well.
Doug