I have a friend who has had one for several years. He really loved it but wanted something a bit sportier. Instead of selling it and buying a new one.. he set out on a year and a half long project that resulted in this:
The bike lost a lot of weight, as the tank and seat are carbon fiber, as well as a lot of other components like the airbox. That is where I helped him out on it.
It is one mean, mean machine. The front triples are updated to Yamaha R6's I think. Lots of custom machining. He did it all himself though. I was really impressed when he unveiled it. Made me want to buy a hawk and make one too.