Ahhh I could not resist. I have made another one. He was actually alot simpler to do than the first but looks just as good I think.
I used the left over arms from the previous iron priest and re-used some parts from my old adeptus custode army to make a suitably mechanical backpack. Of course I added a few pieces of wire to give more dimension to the pose of the model, and they also help to tie the pack and the arms together. The torso and mechanicum axe are from a really old blood angels command squad I had left over in my closet of doom that I completely forgot about until the clearout. Found just at the right time to make me another iron priest :)
Thoughts and comments as always welcome :)