Germanunkol : From memory, I think he was just going to animate the texture of the tracks.
Besides some up "up-and-down" vertex animation as the wheels go up and down.

Jaeger, I think it may be a bit HI-poly, but thats my opinion, and none of my projects
have gone above 20,000 polys on-screen at once YET.
I feel though that your modeller will cry when he sees how far it will need to be "cut-back"
for enemy tanks or LOD levels....

As for its look? Looking beautiful ATM, and thats naked! (without texture)