1) Crimp-on connectors for attaching to the limit switches.
2) A "refrigerator switch" and mounting bracket. Perfect as a safety interlock for the door. The mounting bracket would make it complete as a unit; you can't sell just the switch!
3) 18AWG (1.02mm) wire with silicone insulation and high strand count for flexibility to run the motors.
4) Snakes for routing cables and hoses.
5) Cable organizer/clamps - like this: http://www.cableorganizer.com/adhesive-cord-clip/
or like this: http://www.ebay.com/itm/100pk-DIY-Self- ... 2281&rt=nc
What would really help is a "completion kit" that included items of this sort, along with suggested locations for the electronics in the shelf. Not that anybody would follow them ...

Andy