Well, Kid, the cool thing about building a street fighter is, you can just buy pretty much any crash-damaged sport bike cheap, and you already have the basis! Just about any parts that get damaged when someone crashes a sportbike are the very parts you'd be trashing anyway. So you can have your pick of bikes to start with. Then, just add a few parts and a paint job, and you're all set...
Someone got a crashed CBR900? Give 'em 3 or 4 Grand, and you have your street fighter!
I'm actually about to start my own project: I've raced a TL1000S for the last three years, and I was about to sell it as a stock street bike, but I decided to keep it and make a V-Twin Street Fighter! I haven't seen too many TL's used for this purpose, so it'll be kind of different. And talk about a wheelie-monster hooligan bike!
I'll keep everyone updated as the bike develops...
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"If you want to keep working here, Son --- stay off the drugs..."