You $300 at work!
My studio's modeller (I call him Big C) has spent the day working on this. He sent me an email with a screenshot that I will share with all of you.
He says "I really wish there was a straight on reference image I could use for this. It's a bit difficult to judge some of the proportions. I'm working to finish the basic overall shape of the creature. After that I'll spend a few days adding in the muscle forms and tweaking proportions"
I already gave him all the hi-res Volition renders of the Vasudan and some screens from some of the cutscenes. But he's right, there isn't any good reference images in terms of getting the proportions right.

However, it's a fantastic start! He is going to texture and rig him too.
Just a note: Save your breath, he doesn't read the forums. I'll be working with him to make sure we get a quality model for the community to use.
[attachment deleted by ninja]