Ultimately I decided to harvest what goodies I could and build a Wilson TS. Its more or less what I was wanting to do with the Two-Up anyways. XD
Being able to reuse the printrboard clone would be helpful... but I am having difficulty finding any splitter cables specifically for splitting stepper signals. Will something like this work? The connector is not exactly the same, but it could be modified to work I think.
It's actually already running a custom Marlin build. Plus, I have decided I am going to repurpose it into a Wilson TS. The design of the Wilson is more or less exactly what I had in mind for the Two-Up, plus the designs would seem to be compatable other than a few small differences. So I would only need to do a few small tweeks to the firmware settings. :D
However, I am having trouble finding a proper Z-Stepper splitter cable. Do you happen to know where I might be able to buy one? Maybe I am just using the wrong wording when searching. XD
Would something like this work with some modification? http://www.amazon.com/StarTech-com-12-Inch-Power-Splitter-Cable/dp/B005G3010U/ref=sr_1_6?ie=UTF8&qid=1446164216&sr=8-6&keywords=4+pin+y+cable