I got an email out of the blue from a guy that is aware of a parts 600 near Austin Texas. I have no idea of the validity of any of this, but thought I would pass it along. If you are near Austin it may be worth a look...
Steven,
My name is Khy and I live in Austin, TX. There is a junk yard about 40 minutes from here in a tiny town called Thrall. The owner has a complete Honda 600 out in front. He has no title on it so it is a parts car. Too bad. It's one of the early years, 69 or 70. His number is XXX-XXX-XXXX and his name is Mike. Pass this info on to all the other 600 owners you know.
Seriously, the car is complete and is a parts goldmine.
Khy