Excellent site, superb job done on their Freightliner Sprinter. Well documented. If you are going the DIY route you must take a look.
http://www.steynfamily.com/ultimate_...ing_van_02.htm
The site takes you through every step of their Freightliner Sprinter Conversion project. Topics include insulation, paneling, wall covering, sound and GPS navigation systems, inverter, racks, new wheels, customizing the rear step bumper to accept the factory tow hitch and putting on the Mercedes badge.