http://www.dakkadakka.com/gallery/57916-Un...20Eater%29.htmlMy version, based on those ones from the Russian site.
The quickest and easiest way to do it is get CSM or SM legs, shave off the back of the greaves and the upper thighs and hips, then GS chainmail on the areas. The CSM Bezerker chests usually work well with it. Lastly is just a Cadian head, which you can model a couple different ways. Easiest is just to shave down the IG icons and put a horsehair crest on there