Having spoken to the owner of 42101, it really is an interesting story. I won't go into it all for obvious reasons, but the locomotive was missing several components from the motor when purchased and also all the traction motors, and was about to be cut up for scrap.
Now, 24 years later and after several years of inactivity while just stored, he has finally seen the fruits of his labour, and is understandably extremely happy about the entire story. There's been ups and downs, and a change of location (Goulburn to Eveleigh) along the way, but it's nearly at the happy ending of the restoration. Then there's a long operational future ahead of the locomotive.