I have never seen a human being able to make such advanced modifications to themselves.

[He sounds impressed. For all that he's grown to like them, humans can be a very stupid lot. The Terminator lets his infinite patience go to work while Joji works on his arm. Getting it back into any working order is going to take a wing and a prayer to achieve, but several of the smaller pieces easily bend and twist back into place. He shakes his head at the idea of skin grafts.]

The organic covering will heal by itself, with time. Except for the eye.