I don't think this was about practicality. It's about owning a piece of garage-art that makes people say, "Wowwwza".Interesting, but hardly a practical motorcycle. Also looks unridable due to ZERO ground clearance.
I first thought you were talking about a rotary powered motorcycle, like Suzuki and Norton built. I believe a rotary (Wankel) engine would be perfect for a motorcycle, Mazda is still using them, and has all the bugs worked out. They make a lot of power for their size and weight, should be perfect for a sportbike.