The head and the hands are from the T-800 Endoskeleton, the rest of the body is from T-800 "Pops".
I drilled an hole in the chest of the T-800 then I cut out some pieces of the shirt and put in the hole a green piece of plastic that I found at home and it looks pretty good as a piece of kryptonite.
Then I glued on a plastic circle on the chest and put on the shirt.
For the neck I cut off a piece of the neck, sanded it off and placed a litte tube from the endoskeleton.
Obviously I painted the eyes of green.
Enjoy!