I build a series of products for greenhouse growers...large and small. I have always been more of a software guy, but have bled over into hardware heavily over the last few years. I am trying to build something slightly more modular than a standard panel. With the intro of the RPi kit, I am considering a few products targeting smaller operations. I try to minimize wiring between the modules to make it easier for customers. I am stuck on a clean way to pre-wire plugs between a panel containing the opto relay modules and another enclosure containing 4 small peristaltic pumps (24V). Ideally, I would ship these small enclosures to clients...they mount on the wall...plugin without wiring diagrams...ready to go. Any suggestions for simple wiring between enclosures?