Something tells me that extra board could be for the 0-10V for the spindle drive, with the big ribbon cable simply being convenient for connecting things.

I've got to admit, I do have concerns for if any of my Dynomotion stuff dies, as delivery usually takes a couple weeks or so, mostly due to Customs clearance. However, I've not yet killed anything, and I do currently have a spare KFlop/Kanalog/Konnect bundle.