After hours of research on low-cost prosthetic arms, I spent some of my own time designing and 3D modeling the casing of a prosthetic arm. Once the specifics of the amputee's case is known, this body can be customized to fit their exact needs.
The front view, back view, exploded view of the wrist bearing, and palm design can be seen below.
The overall hand design is inspired by Mahdi Designs, however, each component was solely designed by myself. As time allows, I plan to continue this design until a muscle controlled myographic prosthetic arm is practically being used by an amputee.