Havent been 'in the scene' for quite a few years now, but I did (and still do) use VL turbo (now VY twin spot calipers) and V6 Verada disc rotors (DB425 from memory, without wanting to go to the stack of at least a dozen farked out rotors) on my P510 race car.
The calipers are 'Bolt on' to the Datto Struts, 1600, 180b, Z car etc etc
The issue is the DB425 rotor is drilled five stud to suit the Verada... you can buy them easily from Burson or Repco un-drilled but you then need them machined at the correct 4 stud PCD.
A couple of other 'secret' but simple issues are easily overcome.
Will help you out where I can if you want to message me.
Cheers
Cam McKinnon
p.s. these are the brakes in action on newb tube
http://www.youtube.com/watch?v=aE4W6H2NcEk