Peace Maker mech concept

I have an original story that I want to make, it's called "Peace Maker". The story focus on a boy/man and a robot.

Here's the first pass of the mech, will do a few more passes before making it final. Weapons and accessories will be added in the end.

I don't want to make a super original/stylish mech, I just want to make something generic - a big heavy duty looking robot, because the story is not focused on mech, but the man/machine relationship.