I've done the external facelift. As you've got the complete car it should be easy. You need to make a few body mods to fit the rear bumper and headlights. You also have to modify the headlamp wiring to make dip beam stay on with main.
Got 320mm discs coming for the rear. Suspect the fronts will lock before the back starts skipping and leaving the floor. May need a bias valve don't know yet