However, there is one issue, when i adjust the size of the length, in order to keep the proportion the same, the hole will be smaller. if i adjust the size of the holes, hinge joints will defore and cannot work. So suggest in future, can make a parameter so user can freely adjust the length width height, without affecting the hinge joint. I am an therapist and try to apply this design on my flacid tone cerebral palsy patient, not sure how can it be done, but i am truly grateful about your design and sharing