Replace the front brake lines. Geometry is a key on bikes. I won't go through my old set up on shock lengths and fork heights, but it makes a difference. Save weight? 520 chain and sprockets are a start. Find out what guys are using on R6's at your local track for gearing. And bodywork is weight savings too. If you're down south and you're gonna run WERA, make sure you can modify the wiring harness for the classes you might run.
Keep it simple. Make it race/crash worthy, focus on getting it slowed down (brakes) and handling (geometry, correct spring rates [if you're a lightweight, the stock rear spring is way stiff], maybe replacing shock and fork work), and then ride the thing. Find someone that can help you in your riding to cut your learning curve. You need someone to tell you "no" on some things your trying so that you don't waste your time and money.