While his models look alright, he does no custom projectiles nor any coding for any of them, he uses the default tank projectile. Horribly imbalanced if you ask me.
I use the default tank projectile MODEL. The stats for each tank's shot are different. For example, the Matilda's projectile does far less than, say the Tiger.
I tried my best to make it balanced. Just don't use the Maus or Ratte and you'll be fine.