I'm surprised there's debate about the original Robocop's design...it's clear from the first film that they "lost" almost all the organic parts. Basically the head and brain are all that are left.
Secondly, what happened in that movie has little bearing in this one, so the arguments about what's "proper" Robocop are moot, since this is a new incarnation. This point reminds me of the endless comments about what was proper for Khan in TOS/TWOK, when STID was a new reality..
His torso is organic too, hence the blood from when Lt. Hedgecock's men and ED-209 shoot him up and later on when Boddicker stabs him in the chest. I quote:
"We were able to save the left arm."
Bob Morton: "What? I thought we agreed on total body prosthesis, now lose the arm, okay?"
So based on that dialogue, it's definitely Murphy's torso, brain and face with robotic arms and legs.