You know, a tall turret is actually a very bad feature for a tank to have. It makes it easier to spot and a better target for enemy tanks to fire at. Most lethal rounds against tanks are to the turret, so it's better to keep it squat and low to the ground.
Also, tanks in general are terrible streetfighting machines. They're big, heavy, slow, and very loud, making them easy to locate and engage from the rear or simply avoid. But if you must use them in an urban environment, adding a machinegun to the rear of the tank could help keep opponents from flanking you.
Beyond the tactical side, of course, it's a snazzy-looking tank, and in Brikwars, looking cool often means being powerful!
Were it that simple...