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I keep the betteries in the back. At the top of the back there is a lot of space.
So there are all wires with some plugs going into my back.
I just use 2 arduinos. one for helmet one for my backflaps.
the hands are with normal switches.

if you take a look at the videoes carefully you see two positions for the switches. at the round parts of the hips. are two switches. one at each side. at the beginning I had a switch at the helmet itself.

hope this might help you.