Hmmm. I think before anything else you should look over Nico's Moloch; as far as I know he hasn't finished it, but there are a lot of good ideas in there. You should also look at the original Volition concept art.
I don't think this is really much of an enhancement, to be honest. The form and shape hasn't changed at all, all the details have just gone into ribs that are too even and mechanical to look Shivan. If anything, they should be modeled after organic ribs that curve and taper, like the ones on the textures. The Moloch should ideally look like something from H. R. Giger's nightmares.
This treatment might not be out of place for the Rakshasa, however.