The front is easy - the forks bolt to the mount.
With the rear my original thought was to just strap it on really well around the bike's bottom bracket (which is sitting on some extra Shorai battery foam
) but I just had an idea:
I could run a vertical piece of 8020 about a foot long.. and then remove one pedal from the bicycle and mount the bike's crank to the vertical piece through the pedal hole. The 8020 aluminum extrusion is incredibly strong - this would essentially turn the entire bike/rack into one solid structure.