Well as much as I'd like to claim that magnificent beast as an Aussie build, I know that bike, it was built by a journalist for "Cycle World" magazine in around 2000 or 2001, and was known as "Big Benly".
I've still got the magazine at home in pride of place with some of my favorite CB750 literature. He built it for racing and it was entered in a lot of classic races in 2001/2002, and was even taken to Britain to race at Mallory Park, and the Isle of Mann too, I think.
Beautiful bike for sure, I took a few cues from the build photo's when I braced the frame on my (stalled) racer project. Cheers, Terry.