I like your idea and I have never seen it or even heard anyone even talk about something close to it. Done right I think it would look good.
I agree! I think it would look really cool. The first way I thought of doing it wouldn't work though. The side edge of the roof has a sharpish bend in it that would have to be carried forward in a straight line, so I couldn't slice a piece out of the front to bring it down to keep the slope the same. So by just cutting and moving the piece forward would have the top surface of both roof and piece on different slopes. Not sure how to fix that. I've seen in magazines when the chop a top they make slits to change the slope, but now its getting scary difficult. I also can't find a close-up of a '56 to see how much the roof comes forward from the top of the windshield. If anyone knows I'd appreciate an answer!