Brakes Wheels 1st Gen Tires R56 Rear brakes on a R53

I know this has been brought up before however i was wondering if anyone has succesfully made this happen?i know there is a mini2 forum post of someone who did it however i cant seem to find it...i have the calipers/pads/rotors/lines...i have a set of R53 e-brake cables and near as i can tell that they need is a little bit of drilling in the opening on the caliper to fit them through...anyone have any thoughts on this....im committed to making this happen since i have everything to make it happen