Turns out its a early 80's Kawasaki Z1000A1 engined Predator. The one that looked like shit!

I confirmed that it has a nickel frame etc, so it all sounds like a Rickman.
So I'm going to look at it this weekend, I'm disappointed that it is not a CR.

Should I buy it anyway?, should I forget it?, or the reason for posting, can I put a CR tank and seat unit on it? Was the Predator and CR frames the same?
I also have a Z1B and a Z1000J
Thanks
Nick.