Sorry for the crappy pictures, but it seems I only find time at night to mess around with the lambo. And my current workspace in the barn is poorly lit. Anyway I started mocking things up and what I found was the size, shape, and curvature of the window is all pretty close. Where the problem lies is the tracks do not have enough curve to fit completely inside the door. I ran a straight edge across the body until it hit the tracks and measured up to the bottom of the glass. By doing this I determined that the window would be able to roll down about 6 to 7 inches which is about half of the window height. I think that if someone were to just use the glass and regulators you could make it roll down further. I am leaning towards only having a window that rolls halfway down to keep things simple. Anyway this is about as far as I am going with this for now until I can get door hinges and mount my doors. This is by no means a perfect option but it is definitely an option. I don't want guys to get the wrong idea and think this will be a perfect fit, there will still be fiberglass and welding involved for sure. At the least I think someone could use the glass, regulators, tracks and weather stripping from the doors on their fiberglass inner and outer doors for a complete custom build as it is usually done.