Today's efforts......
necessity being the mother of invention, I Macgyvered (an example of a noun being used as a verb) a bike stand and erected the big top (rainy here in Brisvagis today)
one step back and two forward _ put the XS11 swingarm back in the frame to make some important measurements - then re-installed the TRX swingarm/wheel - my new front upper mounts need a little adjusting - not symmetrical as it turns out...cleaned up the rear wheel, installed new 530 gauge sprocket....
all a bit boring really - but - the tale of the tape
removing from the bike
XS11 swing arm/diff 15.10 kg
XS11 rear wheel/caliper/axle/spacers 21.40 kg
XS11 middle gear case 5.65 kg (no oil)
replacing with
TRX swingarm/wheel/caliper/axle 23.70 kg
new output shaft/sprocket/bearings 2.0 kg
revealing a net loss of 16.45kg from the rear - I haven't quantified the front as yet