Looks like the drivetrain & wiring may be a fun project. The mold, rust & interior work may be less so. You might have some, um, "tenants" to evict...

So this is an OM314? Based on the nameplate, OM314/352 - IIRC the OM352 is the 6 cylinder DI diesel used in Unimogs. So this may be the 4-cylinder version of the same? With the direct injection diesel & a dually - you got yourself a Mercedes truck chassis! I seem to remember seeing similar style vehicles in Germany that would be converted into delivery vans, ambulances, and flatbed trucks.

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1976 240D "Katja"