Quoting Daniel Brilliant
If I'm not mistaken, that is motorized. I like moving legos. You should post a video so we can see it in action.
Yes it is motorized. Most all of my creations are. Sadly, it has been taken apart, but I have a better one here: http://www.mocpages.com/moc.php/312894
You should look at some of my other creations, I have some better ones than this tank.