I really feel like people need to stop trying to make these sorts of robots look so "human-like". The effect of a mouthless bald doll head strapped on top of an iron man robot isn't exactly comforting, to me anyway. It starts to hit the uncanny valley a bit
Presumably they want to eventually put a human inside it, in which case having a humanoid robot to work off of wouldn't change the aero calculations and designs too much. The article talks about specific design considerations to avoid the exhaust gases.
I'm imagining a team just putting the organs of a human into the robot to save on space. Basically a brain plus whatever is absolutely necessary to run the brain.