As far as a rotor that slips over the hub adding 1/4 inch of thickness, I'm all for it(You could sell the 1/2 inch longer Quest van wheel studs with your kit). If it's a newer easier to find rotor that is off the shelf, that would be even better. With your kit, are you considering the S12 and S12W calipers like the S30? it would be nice to have a lighter aluminum caliper, though. Even a good twin piston would be OK.