Righto, this is extremely simple. At least to me!
You’ll need
PVC that fits snug around your arm -10$
PVC that fits loosely around your fingers -10$
Whatever color paint you want your fancy arm to be -5$
EVA foam -20$ (It was free for me. I already had it from past projects.)
Skin tight black long sleeve shirt. Make sure the material is smooth! -5/10$
Gloves that are similar to the shirt -5$
The first step is to cut the PVC to te length of your fore arm. If you want a full PVC arm, cut one for your upper arm too. Cut 28 inch long segments of the PVC for your fingers. Follow the same instructions for the fingers as the arms.
Next, heat the pvc, I used a propane torch, but a heat gun works great.
When it’s heated up enough to be molded, make the entire length into a oval shape. Make sure it fits over your arm at the end!!! The only reason you shaped it was to be more form fitting!
Once you have done that, place the PVC vertical. On the side you choose to be the under arm, cut a line top to bottom.
This will case the PVC to act like a spring and grip around your arm. Additional molding might be required after the cut.
Paint the PVC the color you wish it to be.
If that’s all you want, skip the next section.
After you paint and dry, cut out shaped in the EVA foam. I cut small knobs and a long rectangle. The rectangle went along the entire length of the arm.
Use glue to attach the EVA.
Cut a arm off the black shirt, and slip it over your arm.
Put the pvc over the shirt, and if you shaped it right, it should fit snugly and not slide around.