What if we made an M26 Pershing the way Singer makes classic 911s?

Well, not exactly made of carbon and houndstooth, but what if we had a Pershing tank that had composite DU armor with reactive blocks, a computerized fire-control system, a gyro-stabilized auto-loading repeater turret with an M134 Minigun and TOW missiles for secondary armament, and a twin-turbo LS9 engine?

How many things can it fuck up?