I just don't think this would work for Superman as it does for some characters. One thing I think people over look is that it's not just about height. It's about the actor's size in general. Movie magic only gets you so far. Look at those Japanese car ads with Bomber as Superman. Yes I know some will argue that the commercial isn't like a big budget film and that they aren't doing what could be done. Sorry, still don't see it working. To me you can give him another inch or two and he still would look way too small for Supes. His (or any actor of the same height) overall build and proportions are much smaller than you would get with someone say over six feet tall and it shows. I still hold strong to the opinion that the actor playing Superman at least has to be 6'1". Just my opinion though.