Just found this while browsing videos. I spotted one video with the sliding door concept, towards the end of the video it shows 2 gen 1s with the sliding door concept. So now there are 3 in existance!! I wonder what happened to them?
http://www.metacafe.com/watch/1452380/new_technolugy_in_car/
http://www.metacafe.com/watch/1452380/new_technolugy_in_car/