Can't help you with the photoshop but it just dawned on me that if you do the Duster quarters you could maybe make a wider "shelf" on the top of the quarter similar to a 68-70 charger
That would be an interesting idea for a wide body Valiant. I think I remember something about that over on ProTouringMopar. (On a Dart, I could be wrong, though).
I'm mainly just interested in the wheel opening. I was over on the HAMB forum and there was some talk of using Volvo front fender openings and it got me to thinking. Apparently a dangerous thing.