I made a very crude Jebao cable, following a video on YouTube by a RA user. Used a large circuit board. Drew the wiring schematics using a permanent marker on the board. Then etched the circuit using Ferric chloride solution. The cable looks bulky, but it works with the RA. Here are some pics.

That is pretty awesome DIY.

Makes me wonder why they didn't use the eagle files posted here and have a PCB board made up. Or for about the same money as we'd spend on parts we can buy a control wire setup here.