At the suggestion of MiniWarBlog in my comments I reposed the contemptor's torso and assault cannon.  To get a minimal cut I used a sharp exacto knife rather than the razor saw.  The saw would have cut out about 1mm out, and I didn't want to build a spacer.  So I rotated the torso slightly and did the same with the weapon arm to give a slightly more dynamic pose.

Here's a look at the top half of the torso after cutting:


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