Dracula had been wishing for an upgrade for a very long time. As Dracula realized the hardships of having a 1.63 meter (5 feet 3 inches) short body two months after his creation. He was really tired of having a cute kid shaped humanoid body.
He had many traumatic memories caused by the members of his master race due to his cuteness. Every old lady and the young one will squeeze his cheeks or ruffle his hair every time he went out for shopping. He didn't like that. Not even one bit. Who would like to be touched by strangers? Some may like that but Dracula was not one of them. But Dracula knows that his appearance seemed really cute to the eyes of beings belonging to his master race. Which led to their actions.
His kid shaped robotic body was a serious hindrance for him. He couldn't perform many actions due to his short stature. His height was only 1.63m. Not only that, his small body had put a limitation on him in the recent combat against the zombies.