Congrats on getting a Sportsmobile! We've had one for a year and a half and are very happy with it. Looks like you are getting the RB50 floorplan. Are you getting the diesel engine?
Regarding the top folding down, it does so in an accordion fashion. There are two bunge cords around the top that pull it in and it folds as it drops. They suggest you stop half way down when lowering the top and push out the front corners to make it fold neatly. It seems to work well.
Some photos of our van and the Sportsmobile West factory are at:
http://www.pbase.com/railbat/root
Look under the Travel and Sportsmobile project folders.
Regards,
Brian Rutherford