For the arms, I built multiple geared assemblies that would wrap around my arm, yet be able to compact into a much smaller space in the briefcase mode.
I used a 3 ft. long piece of elastic strapping and attached it at the center of each assembly using fishing line and a curved needle. Then, I used thinner strips of elastic strapping to connect the ends of each assembly, allowing them to follow each other when wrapping around my arm.
The elbow was specifically designed to bend, while maintaining the appropriate shape as seen in the concept artwork.
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