Simone killer blog and i have it bookmarked and will be following! Yes will be thinking about some sort of coupler for the motor shaft like you are, I think I will be having the same problem.
I, like the other Frank, am sourcing some parts, the spreadsheet is pretty good but there are a couple of things missing. Of course David sounds like he will update when he can, thats fine. Frank I ordered some tether from mouser link below.
Its 150m so I think I will cut 40-50m and just use with the existing baluns and then when there is a breakthrough in transmitting longer distances I will have the 100m tether ready to roll. I am slowly getting a mcmaster carr order going for some misc stuff. Hopefully its most of the stuff Eric holds up in a little baggy at the end of the recent unboxing video... I think only thing I am unclear on is the molex 18pin plug... maybe something like this? cheers