I love it! The cross-over of motorcycle type customization with racing aircraft it's BRILLIANT. I guess the only reason this never happened is pure psychology, because motorcyclists threw caution to the wind, whereas aviators worry about CRASHING heh-heh. But perhaps the bigger question is one of greater speed, where SLIPSTREAMING is vital beyond a certain point. Even so, I can see several valid arguments for removing the engine cowl!
I almost missed seeing your other designs parked in the background