Concur, Gaucho.
I can't post the link now, as I am on my phone, but there's a couple folks on 4btswaps.com documenting install of a 617 in an XJ. It didn't seem too terribly difficult. One thing I would recommend, though, would be to plate the "framerails" up front, inner and outer at a minimum. In my build I will be carrying that through the entire pseudo-frame, nose to tail.
Honestly you can probably get away with not doing it with the Mercedes diesels, but I am fond of durability and upgrades to prevent problems down the line. If you were to use a 4BT I would say those reinforcements would be mandatory
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