HI Markus,
Excellent question. And you are totally correct – when I designed the arm I remember not including the forearm twist because of the issues that caused with the bracers. (you don’t want the rigid gemstone thingy warping when she rotates her hand)
I’m also proud that you found a solution. That’s one of the main goals that I’m trying to do with courses like this. Give you enough information and confidence to figure out solutions.
The best way to learn new things is to pull them apart. Reverse engineer someone else’s work and see how they solved the problem.
Then once you have figured it out, you can add it to your bag of tricks.