Thanks for support although I havent really started yet, can't force myself to get up from the couch (too much meat consumed), so instead I did a small research regarding this character.
So, what makes Nightmare a Nightmare? Despite some drastic changes to design that occured to him with each new sequel, there's always a few key features that remained almost untouched. Here
so could I try to replace those by some tech shit?
On serious note, I'm leaning toward more iconic and clean design (from 2nd game I believe), the top-left, because latest one from SC4 little messy and whole mid-section is missing, which I find disturbing
At this point I dont even know should I bother concepting, it's all right here, minor changes to silhouette and plate pieces to make him look more mech/robotic