I guess I have to say that if you really want an "overlander" in the sense of being able to drive comfortably to Tierra del Fuego and back, then strip off all of the non-standard stuff, put back all of the original kit, then do a full service, renew suspension bushings, and make a few minor adjustments - better dampers perhaps, a winch, sand ladders, slightly bigger tyres than standard on 16 in (maybe 17 in) rims. Figure out where/how you're going to sleep - if inside, strip out the inside and out in a bed; if on the roof, put on a RTT; if outside buy a tent. A refrigerator is handy although not necessary.