actually, I haven't made a tutorial of how to do this yet but will be glad to explain the process
For a tutorial of how to make the shorter original origami claws that you will need to make the long claws, go to: [link] sorry funky computer won't let me add a usable link
I just stacked two origami paper claws on top of each other to make one long claw. I then used tape to stick the short claws together. And when you make the claw for the pinkie finger, I use a smaller sized piece of paper for the origami for a better fit. After that, I carefully cut small strips of duct tape with scissors and covered the claws to make a metallic effect, but I imagine just any kind of paint or material can be used. Hope that helps and let me know if anything needs clarification!