Here's a pic of the forward head mounting plate. The servo behind the plate allows the head to roll from side to side. The two bearing mounts are for the working eye iris. I still need to add the two iris servos, iris cups and the rod end mount to this piece.This is a lot more complex than the previous version I made. Even though this screen accurate head is much larger than my previous low budget version there really isn't much room in it and getting everything to fit properly has been pretty tricky.

I generally try to use as many off the shelf parts as possible as it makes the build easier and makes repairs simpler/faster since I don't need to re machine pieces if something is damaged. In this regard I use a lot of Actobotics parts from Servocity, in this case the iris bearing mounts, 1/2" servo shaft extension, 1/2" bearing support and 1/2" shaft clamp. The servo is a Hitec HS-645MG.