I was browsing around trying to get ideas for a SOHC build when I found this on GooBike (Japan)
http://www.goobike.com/bike/stock_8502134B20100306001/And another similar bike also built by House Rockers in Saitama (north Tokyo area)
http://n3.nabble.com/file/n782795/n00073n49db02db02a14.jpgI'm simply stunned at the beauty of this. Yea, it's absurdly priced at over $40,000, but man, it's totally legal, totally ridable, and totally cool. It's not like I'll be spending 40k on a bike, but what a cool model this is for a project. I could do something along the lines of it for around $4000.
It's bored to 836, has a forged race cam and crank, large valves, Yoshimura carburetors, and has an aluminum gas tank, side cover, and oil tank. Those stainless pipes are a work of art and cost over $2500. Also: Lockheed calipers, Honda NSR 250 Magnesium Alloy front and rear wheels, carbon fiber fenders, etc. The frame is stock although reinforced with additional braces and welds.