You think it is possible to make the PT look like a 70s movie? LOL
Such a thing is only possible if he remakes the movie from scratch, or perhaps gets the original footage with bluescreens/greenscreens and inserts new background footage. He doesn't have the resources, time, or budget for any of that, I'm afraid, not to mention that he doesn't do CGI modeling himself (or has done very little, at any rate).