I like the idea of evil runes on the seals. Someday maybe I'll be brave enough to freehand runes. I did try to make the seals look aged and filthy as a half-measure...
Yea, I use it as a Chaos Dreadnought for my CSM force. I agree that adding a more evil-looking driver and removing the purity seals would have helped, but I'm still pretty new to conversions so I kept it simple. Thanks for the comment!