Guido- most alarms shops with Mercedes experience know how to install both central and remote door locking. Unless your kit makes it look factory installed, the price seems steep just for the kit.

Also, most of the engineering/research have already be done right here:

http://www.peachparts.com/shopforum/showthread.php?threadid=11777&highlight=remote+locking+300E

http://www.peachparts.com/Wikka/W124Keyless

Show us more of the finished product. That would probably help justify the price.

:-) neil