all helicopters have the problem that they don't "look gigantic" in fact, all military helicopters are huuge, stretching 17m or so in length! an example of this:
http://www.konami.com/article/KONAMI_LAUNCHES_ORIGINAL_FACEBOOK_PROMOTION_FOR_SILENT_HILL:/170 Perhaps some of the artists here might be interested. A good opportunity to get something published in a real game.
An evolution of the demoman in tf2. love a couple of the early concepts they had, but as pointed out they did not seperate him out fully within the game. http://www.teamfortress.com/post.php?id=1783