@Michael McKelvey posted:@imperial, I think Specialty Auto had a design for roll-up windows in a Speedster. I saw a video of him describing it. You may be able to find it with a search.
On my one and only visit to SAS many years ago, I seem to remember Steve Lawing telling me that he used the power window regulators from the donor Subaru Impreza. He had made some custom mounts inside the doors and also used the window channels from the Impreza. It also appears that he had a more substantial windshield frame with tall, straight corner posts more like those on a “Convertible D” to allow the door glass to seal better.
Google “specialty auto sports” and then click on images to see a bunch of his cars for comparison.
He also assembled an articulated top mechanism similar to an original 356 Cabriolet and even powered one of them.