Hi Kidraver
Unfortunately I haven't looked into photographing car interiors but can recommend a view of a Landrover Discovery by Will Pearson (willpearson.co.uk mods if i'm breaking any rules pointing to a site then please delete), he does 360's and Gigapixel images........absolutely superb. John Houghton, who's a regular on this site and has given input on this thread has another excellent site with tutorials too.
I'm currently in the process of emailing a few places (churches etc) to get more material for my site.
Anyway, if I can help, I will, as I too need lots of help/info off the more knowledgeable on here.