Thanks to TOYARK.com boards member 907shayne for posting up images of his Super Articulated RoboCop Custom.
“For the articulation, I cut the ball joint necks off of 2 joes, attached them to the shoulder area, and dremeled holes in the arms to join them. For the elbows, knees, and ankles, I took a star wars figure, cut the corresponding joints, dremeled them down, drilled holes into the Robocop model, and fit and glued them in. The waits is a cut joint, and the hips are a V-cut joint from the original model. I kept the head as a peg/cut joint, but I think I may change it to a ball joint so there is more range of motion.”