It seems to be a bit more of a pain then I expected.
Lots of xml templates were changed , deleted and / or merged (comparing Kodi 15 to Kodi 17).
Also since latest official version of Kodi is still 15 I would have to maintain 2 versions of the skin :-S
I’ve read somewhere an A6 4F uses MOST Can-Bus (optical bus). Did you get to manage any communication between your car and the raspberry?