Posted CAD of the implementation
here.
This is a real rough model showing our concept for mounting the ballshifter only, it's a bit clunky now and if we ran with this we'd likely refine the mount a bit more.
Don't interpret this as a specific decision by 973 to do 8wd with that spacing, those wheels, etc... but rather focus on the ball shifter interface, and that we're switching to 1/2" hex all around in hex bearings.
Hopefully this helps a few people.