Apologies for the lateness of this reply: I've been focusing on getting the giant robot ready.
In regards to your question about my unpowered exoskeleton, it depends on a ratio between the waldo arms and the outer arms. Specifically the distance from the cable anchor point and the elbow. A distance of 3" on the waldo arms and a distance of 6" on the outer arms would make the outer arms move 1/2 the distance the waldos move. The inverse is also true: 6" on the waldos and 3" on the outer arms would make the outer arms move 2x the distance of the waldos.
Hope this helps!