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Few reasons behind it.
Some sanctioning bodies require it to have been a production vehicle, most of which are not given VIN numbers until later in the production process.
Its far more difficult to get a partially completed chassis because of the assembly line process, and the order in which components are installed.
Drag racers can, on occasion, order a "body in white." Its just that, the bare shell of a vehicle in white primer. They're very difficult to obtain, have no VIN, and are very pricey to obtain. Aside from the time it would take to strip the vehicle, its typically more cost effective to part out what you don't use from a completed vehicle.
As for the models, there are two primary reasons. One is for rulebook purposes. Some sanctioning bodies will only allow certain models, and if all models are allowed, the motors must typically be based off the production motors. As a made up example, if your model came with a 2.0 naturally aspirated model, you couldn't race using the 2.2 turbo variant unless it was available in your model.
The second reason for the models chosen is a bit more straightforward. It's for advertising purposes resulting from sponsorship.
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Living in the United Socialist States of America.
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