In countries outside the USA there are often very good reasons for doing the full chassis swap, with no significant modifications, in order to obtain the mandatory government certification of road worthiness. New Zealand, for example, has stringent requirements for chassis engineering, basically saying that an OEM design is pre-certified, providing it is not modified; but any change in geometry must demonstrate proper engineering to stringent standards. Thus for jb's RV school bus conversion the best way through the certification maze was to drop the body on a Chevy dually truck chassis. We also saw a nicely done early thirties Hudson (I believe it was Hudson, Tony's car) that's full fendered, sitting on a Toyota chassis. I'm not saying that a chassis swap cannot be done in a way that the finished product "looks right, functions right" (this '40 and the examples posted by Tech above are examples of the "right look"), but I am saying that once done the vehicle is now a hybrid, classic body sitting on modern chassis, and for most of the USA market the value of such a hybrid will be significantly lower than a body & chassis that's been updated with a modern running gear. That's my opinion, it's not likely to change, and others are free to form their own opinions which differ.