Here is a link to a car that is close to a rebody, yet still is not.
http://agar.homestead.com/myridesbarrelcuda.html
I would give it a rebody pass. The owner is very up front on pictures before it was painted (baremetal firewall/cowl), its donor material (not a complete roller), the tons of work done to salvage it. I would consider it a legal car.
now is this maybe also a proper rebody by some? or is that even more metal replacement than this car? note the owner of this cuda in the link is not calling his car a rebody.