So I think we're in a good place, there's a few things i'd change.
-In the concept art the guns are bigger, and legs are smaller. Same as the model PERSONALLY I don't like it, and I don't believe it, but I'll try it out to see how it looks.
-I"m happy with the gears on the leg, BUT I'm going to remodel the middle leg section, I'm thinking about how i'm going to retopologize it, and its going to be hellish. (to me, maybe to a more experienced individual they could accomplish it no problem.
-I would like there to be some mechanical stuff under the base plate of the immortal, right now its just empty space. I'll put a cube down there for now to fill it up.