Sorry, I don't have a scanner like that. I could send you pictures/video of the cables on my moutain bike.
Perhaps someone else who has actually built one of the things can chime in.
If you have the cable jacket/housing butted up tight into the brake lever barrel adjustment screw, and the other end of the cable jacket clamped by the two halves of the trigger arm housing, what happens when you squeeze the lever? Could it be that the cable jacket is moving within the trigger arm housing?