The only issue I have with this one is that the bat head needs big ol' bat ears. They could probably fold flush against hte robot chest in robot mode. Otherwise, this rules so hard.
Love it! I agree it would take this bash to the next level if you could turn the wings upside down, or better yet add a little to them to make them look more batwing-ish. But I really love the whole idea you've got going here! And the headmaster is fantastic! Great job!