Hm I think I may check something on this too... especially since my traditional editing didn't go in a way I would have preferred therefore I may use up your blend file to make a good looking one.
Here is my try at the corvega Lizard's model helped a lot but since I wanted to make it with parts I had to restart it. Also I used for reference the in game sceneries instead of the intro one.

Man I feel like I'm hijacking this thread hope the topic starter don't mind it.