I just posted this video to my YouTube channel which has more details on Z3US.
Here are some more specifications:
With the arm at resting position, Z3US is 65 studs high X 39 studs wide, and has,
2 EV3 bricks,
2 NXT bricks,
4 large EV3 motors,
1 medium EV3 motor,
and 5 NXT motors.