I really really really like the MOC that duckbricks reviewed that makes an appearance among these, it looks like an actual set in that it looks cool but it's very modest. Makes it very believable. Also the way it uses the Titan pistons THROUGH the Piraka arm in the digitigrade leg is absolutely brilliant.
I honestly find this character fascinating to a degree and its a shame we never really get to see more of him. He reminds me of Perditus with the fact that he was an agent for Velika but unlike the latter he actually had something to do, and letting the toa participate in a hunt where they are the prey makes him really stand out as an unique adversary (Umarak should be taking notes by now) but also sympathetic as he is easily agreed by the treatment of his bara magna brothers and he works in a pack with other vorox's. Definitely one of few sympathetic antagonists in the bionicle franchise.