Originally Posted by Hawkingbird
It was suggested on the commentary. It seems Zola could be the one that "creates" Winter Solider.
That would make sense since Zola went right to where Bucky was being experimented on to collect his notes and blueprints before fleeing the HYDRA base. After watching that scene I thought that Zola was the one conducting the experiments for Schmidt and maybe with an eye to creating his own robot body. He would be the logical choice to create Bucky's artificial arm. Zola also had a very good idea where to find Bucky after the war since he was on the train and knew where the soldier fell.