Welcome Barbara!
What an undertaking you are about to pursue! I can't imagine taking on such a project.
I am all about the Sprinter van myself. I'd advise you to get a 2007 or less model. My understanding is the new 2008 models will no longer get the same fuel efficient mileage due to emissions requirement issues.
I wish you the best and have fun with it!
Love,
Sharon

2007 RoadTrek SS-Agile