While I'm not crazy about the feet, I do like the overall look of that one. Someone at my
FLGS suggested the Cockatrice from Warhammer Fantasy as a decent starting point.
I love the look of this one, but I'm not sure what was used in the conversion, and I think it might be a bit too big for a normal game of
40k. And my green stuff skills are very much at the beginner stage right now, I couldn't replicate this even if I had all the parts.