So....What is YOUR opinion on VIN swaps ?

Yes just put your dash or vin in another car is illegal. But if your car is made up from 2 to 10 different cars which one is the original?

Some cars are pretty ruff.

Say your restoring a car the front is solid and the rear and the roof is rotted. So you rear clip it the now the car is 50/50 two cars but since the dash belongs to the front half its that car ?? But say now it's the opposite your car has a perfect rear and you front clip it from the window post to where the rocker meets the rear door jam. Now which car is it ? And if you bought the front clip from a wrecker and has no dash or ownership or if you got it from a car that's a donor car that does. Does that make a difference??

What parts do you exactly need to go with the vin to be original ?

Thats called a "cut and shut" clip the rear half onto another shell. Its legal, just go with the car that has the vin affixed to its dash and register that one. The back half is just a parts car.

A buddy of mine pieced 2 fwd caddy coupe devilles together. One was kissed in the back, one kissed in the front. He used the paperwork and title from the one hit in the back since its dash was used and front was left intact.