Wow Wooz, that's really amazing! You do good work.
The only gripe I have (and it's minor) is with that exhaust pipe with all the tubes connected to it. Seems sort-of akward to have something simple like that be a crouded hub for tubes. In your first sketch it looked like it might be closed off, like it contained something. I don't know, maybe a pump/filter, or compressed gas, or electronics. Now it isn't so functionally ambiguous and it's kind-of a give away that those random tubes are there just for the sake of random tubes.