So, there's two Defiler masks on him, one on his face and one on his gut-plate. A Chaos Warrior Shield and the Empire shield from the Giant kit on one shoulder. A Marauder shield on the other. Also there's a Marauder cloak on the back of his belt. The rest just an Irongut model.
Aah I see, I might have to borrow some of those techniques, though the defiler helmet is a bit much for a conversion. This has definitely inspired me to work more on my Chaos Orges. : D