I started out with just a iron man 2 hulkbuster base and decided that if iron man was going to fight the hulk. He might need help? Right? So I first gave him the black/silver paint job and red eyes, chest to save me the headache from painting it later.
Then I added the the two side chain guns from a M.A.R.S. Robot, upper chain gun from rotc heavy duty, and chain belts from transformer rotf rampage

This is the first custom I've ever made and I'm pretty satisfied with the way it turned out. Although I still need to finish up the detail.

Well here's one of the many versions of hulkbuster war machine!
Hope you guys like it!