Where would I cut frame at?!

Hey peeps. So I have a 81 Honda cb650 that I'm making into a cafe racer. I have it stripped ready to cut. But I can't seem to figure out where to chop off to add my seat hoop. There's not much room left from where the 'flat' part of seat ends and the shock mounts begin. It seems If I were to cut just right before in front of shocks that the seat itself would be too small and then I'd be screwed. Any help? Tips? From any fellow cafe racer builders? Owners?
By the way, it's not a custom. And this is my first cafe build.

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