Update
Ok, I've finally removed the pins from the Megatron T-Rex mode shoulder plates. It took some gripping with pliers and then turning and wiggling to get them out.
Once removed, they're pretty much like any other pin.
I also did a test fit into Predacon's torso, and it fits pretty well.
My only concern about that connection is that the motion is very tight. I was worried about breaking the joint due to stress but it looks like it should be good.
Next part of the update, I've removed the rear waist pieces from the hip plate assembly.
Once the torso rotation gear is worked out, the bottom half of the figure can be built all the way up to the torso. I can then leave the hip plate assembly until later.
Here's a pic of what I've done for this update.
