Cool, I had a GPZ550 about the same vintage.
Today I worked my ever lovin butt off! HOLY COW I am whooped, I am not jarshing.
First off I finished pulling the weeds out behind the garage in my "wrecking yard".
Then sprayed some Roundup all over everything hopefully keeping it from growing again this season.
Then I set out to sand blast all the top iron stuff. It was even a bigger PITA than I thought. It took me about 8 hours! NO KIDDING! I am WHOOPED.
But it's done and I am also thrilled.