Complete prosthetic arm for hackberry hand

Complete arm for Hackberry Hand

The arm has been created by a group of e_nable France Makers, for Gaspard15 year old boy born without left arm.
He can activate the hackberry fingers with a mobile bone raising up from his shoulder.

The arm is mechanical
The shoudler is using a lockable joint ball,
The elbow is using a ball_lock rotation
All mechanical locks commands are on the forearm to be easy to access from the right hand.

File provided is for right arm / right hand.
You must use symetry to print left arm.
The latest file is Fusion 360
The step file is exprted from fusion 360 but present some problems.