Mikael;
Keeping in mind that there was really no such thing as a standard Longchamp, there could have been power seats. I can say that I know that my aunts car had two seats out of a Maserati. She loved the driver seat to be mounted on the passenger side, so she could reach the release without reaching over the seat. I do not recall heated seats, but then who knows what happened the "dealers" got the cars.
As for the door, to my knowledge none of the cars had window switches in the doors. The story here is that when the Thor was being modified, the switches were left in the door. Since it was a show car, they never sealed up the door, so when it rained - POOF. I was told that they did not like the idea of the switch in the door, so the Pantera, deauville and longchamp did not have them. But the number one rule applies, no such thing as a standard so maybe yours had them. My car 1981 has electric mirrors on both sides, but they were on the car originally and were removed some time later.
As for the door unlocking, I can say again my aunt's car had a switch under the dash for unlocking the door. Same reason as before, she did not like leaning over. I know she added it in the late seventies as I remember summer of 1977 she complained about opening the door for us when we visited. I recall that it was added before I worked in the factory in 1979, and that when she pressed the button the door unlocked and opened. I think it was therefore attached to the handle but can not be sure now.
Good luck in your wiring journey and keep us in the loop.
We.
