You opened a whole new can of worms! Those gauntlets seem very similar to the base shapes of the 3 other basic types closer to the ROTJ version except for the calc pad missing from the left gauntlet, and the size of the box located on the outside. Hummmmm to make, You could go the sintra route, build a basic clam shell for the arms, "Stack" pieces together until you have the basic shape, then fill with Bondo. Don't be afraid to try, we all want the best out of any project, and sometimes the results we want may intimidate us to the point where we might not even try to attempt it. We are not born knowing everything, All new things are learning experiences. What you learn from making these gauntlets will help you make a better pair next time!
