Use Yamaha mags, your front disc will bolt on. actually on the front you will have choice of Yam Honda, Ducati disc, you will have to mod a lot to run bigger rotors. Yam mags are reasonable price, 400 Yam may be a good choice.
Honda front hub off 750 or 500 or 450, with a spacer will work to build a disc wheel, and take Honda rotors, you may have to run solid sprocket..