The picture below is what I am aiming for for a final product with the different backpack though. I really like the skull painted on the helmet and that was a definite detail to keep.
So I set about doing a conversion with an Assault on Black Reach marine. The conversion entailed a new head, chaos backpack with the chaos details removed and a partial greenstuff sculpt shoulder pad.
The shoulder pad was a bit fiddly, I used a skull then greenstuff sculpted wings on either side. Not perfect but once they are painted I hope they will look good.
Stay tuned to see the painted model.
Vitor