I am re-wiring my '69 Coronet with trunk mounted battery, EFI, A/C, power windows, and also adding power door locks. I have a Viper 5704V car alarm that can do remote start and lock/unlock the doors, plus a bunch of other stuff like has its own backup battery. How hard is it going to be to wire the alarm system into the old car harness? Anyone done this? I'm really interested in how others delt with mounting all the parts like antenna, sensors, siren, relays, and adding the power door locks. Would it be better to mount some of the parts under the rear seat area or center console?