Date registered: Sep 2005
Location: Ann Arbor, Michigan
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Do a search in the W163 forum. You will find many threads regarding this modification.
You are correct about instsalling the Nav drive behind the screen. You cannot load the CDs in the CD changer.
This mod is very easily done as DIY, and if you buy a Nav drive new, you'll most likely be getting the DVD-based navigation rather than the older CD-based navigation. With DVD, you'll have probably 1 DVD for the whole country, rather than 11 CDs, although I may be wrong.
Again, search the W163 M-Class forum.
2002 Mercedes-Benz ML320 (sold)
2011 Chrysler Town & Country
2008 Toyota Camry Hybrid
2003 Yamaha V-Star 650 Classic
2002 Jaguar X-Type 2.5