How the hell is your elephant meant to move :S
it hasnt got any sign of treads or wheels on and what you're currently using for the "wheels/treads" is solid, your meant to make it so it will work, unless it works like that in halo :S if so then thats just stupid.
but if in halo its a workin model then you need to rethink about your treads, because your meant to be remodelin the actual things out of halo in if it isnt workin exact then it isnt a remodel of them or improvements because it will be slidin not actually moving properly!!!!