Re-skinning a roof

Check this out! It may be what you're looking for. He's done a few videos on the Dart roof project.
[ame="http://www.youtube.com/watch?v=TsTi_XRri0g"]Fitting Roof Skin for Replacment 1969 Dart MUSCLE CARS & HOT RODS EPISODE 58 - YouTube[/ame]
He also does a challenger roof in another video that may be some help too. you'll have to search his channel to find it.