Wow, extremely helpful information here! Thanks alot guys!
My Spider doesn't have electric roof, so communication with the roof ECU will not be necessary.
So, to sum things up and make sure i understood everything properly, i need the auto-drop regulator for both doors, an updated N82 Unit and just make the connections between those two (after I previously make sure that connections are possible). After i do this, things simply.. work?
Another question: are all the possible functions embedded in any N82 Unit or are they somehow custom programmed depending on the car they're in? To be more specific, I understand that this Unit also ensures the release of the hood cover on the Spider (even on the manual roof version), so, if i would take a unit from a GTV, will the hood release on the Spider still work?