That's a lot of work on a 4door! most seem to use Audi rear handles to do away with the key, and unlock via the remote C/L, another option would be just to do the fronts, and then shave the rears, rear doors would open on solenoids (poppers) or the Porsche style cast ally handles with P O R S C H E script on them, and probably the least expensive route to go..
Tom
