Since one of the arms will need to be wired to accommodate low-voltage landscape lights I opted to make it out of ½” steel pipe and rebar in a truss configuration (sort of like the way a construction crane is made).
When it was all welded together I ran the wire through the arm and zip-tied the end of the wire to the index finger.
To ensure the knuckles looked like knuckles I cut pieces of PVC pipe and taped them to the joints.
That done I covered the whole thing in expanding foam, let it cure,
and proceeded to carve away the parts that didn’t look like a skeletal arm. 
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