Looks like a fencing outfit...

 

Understructure assembly:

I used rolled up cardstock tubes 3-4mm in diameter, in a partial array at sections to flesh out the thicker sections. These were then secured with lots of rolled cardstock layers. I still need to smooth out the hard edges. Possible solutions include sanding or more layering with progressively thinner paper. I still need kneecaps. That and a better head.

Here's a shot of the ass. Bit bigger than I hoped, but it's done.

More in a few days...