The chest piece and shoulders are Beta Midget parts epoxied into place and painted. In this picture you can kind of see the 'aluminium' tubing that'integrates'/connects the Repto saw to the figure. It's actually a bit of plastice wire tubing, painted and stuck into one of two small holes, one drilled into the forearm and one into the saw.

Unfortuneately, I didn't get a good shot of the Repto saw connector. It's a (small) ball joint epoxied into the fore arm with the peg coming out of the saw. I had to drill and cut a bit to get it right, but it adds another point of articulation.