It's not so much a new form for a documentary to take, as it has been widely embraced by fans with enthusiasm for the material. It's gaining speed commercially in the form of "Maximum Movie Mode" and the like on blu-rays that seamlessly integrate material on top of and alongside a viewing of a film. I'd love to see one of the great DVD/Blu-ray producers, or indeed Jamie himself, tackle one of these PiP/immersive "experience" modes of watching a film for a commercial release.

Having said that, I know Jamie would like to tackle Back to the Future at some point. If you're doing one of these as part of a class, apart from making sure that you can do so (some schools might frown upon the copyright-infringing nature of these projects, mine did), you might be better off going for a film that you enjoy that has significance in film history and those Welles suggestions are a good place to venture towards.