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If you move the trim tag, the Vin# to another body. It's a rebody.
If you don't move anything to another body, it's not a rebody. I think that's simple.
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I fully agree - if the trim tags are not removed and attached to another shell it is not a rebody. The trim and vin tags can be removed but reattached to the same shell. The shell can undergo any form or major reconstruction as long as the original shell is being used and the tags are not moved to another shell.
Here are some pics of my car - even though we replaced every single major body panel it is still not considered a rebody as the original shell was used and the tags were not transferred.
Here is the end result of a non-rebodied car:
