yup good guess, but it's my dads
the interior parts are available from time to time in sultan ke kuh and most mechanics know abou tthe availability.
suspension,... not sure, but perhaps GTiR might know as he had his done a while back in KHI.
leather is a bad idea, the stuff available here isn't perforated and therefore you'll boil to death (same problem with vinyl seats). The ideal material for a mercedes in hot regions is MB-Tex (synthetic leather), you might be able to score a complete interior from the UAE (sharjah).