The V class is a rather complete van; that is true. Personally I like the design of it although it looks a lot like the Vito.
I don't know exactly about the 230 Petrol engine, but the diesel versions are all different from what mercedes uses in their other models, so I can imagine that the V230 is different as well. Some parts will be interchangeable, but most of the parts will be specially produced for the V class...
with a minor 600+k