the Mercedes G was built in scale 1/24 from ESCI (KitNo 3022) and Revell (KitNo 07366) as a four door. ESCI built it stock, Revell as a firebrigade, based on the ESCI. follow the link >modellversium< and scroll down to see the different issues they had. on >scalemates< you can see the Paris-Dakar from italeri (KitNo 3025). I dont know about the bodystyle. never saw a kit review from that...but i think, its the same like ESCI or Revell. All kits are the old one - not the nice new design. Aaaaaand hard to find!
Another i found is from Maisto - ready to play, radio controlled.