I hope that they replace their vital organs with robotic parts. Their hearts could be small engines and their livers could be gas tanks or something. Just a thought
Since when did they not have bones and organs anyway? You could do the skeleton pull and the skin tear on them in MK3. I always looked at them like the Evas on Evangelion. I know that's a weird reference to make on a Mortal Kombat board, but in that, when the robots are broken apart it exposes flesh, bone, organs, all that stuff. Not a lot of other shows or games where you get to see a robot get disemboweled.
I thought that I saw some robotic looking devices with the organs.