gianttomato I think you forgot to mention that the lower control arm may need a gentle grind to accomodate the disk brake stub axle's larger lower balljoint, funny cause you taught me that. Have a read here teenage;
http://www.toymods.net/forums/showthread.php?t=37685 the rn16 has the same setup as the rn20s so it should be the same deal. once you get that stub axle all bolted up look into fj60 landcruiser 4 piston calipers as they bolt up to that stub axle and you can then run a peugeot 604 vented rotor once machined