I've continued this project here: http://www.instructables.com/id/Build-a-big-crane-game/
Step 24: Wire-ing
All the wiring should be the same as for the smaller test rig. You just need longer wires!
Network cable (cat-5?) works well for this because it is reasonably flexible and gives you 8 wires in one cable. I am keeping arduino and the driver boards on the bench for now, and just running the power up to the motors with about 10feet of cable
-4 wires to the stepper
-2 wires to the DC motor to raise and lower the claw
-2 wires to teh DC motor to open and close the claw.
- I used a cable from an AC/DC power adaptor to run power from the network cable down to the DC motor on the claw.