Can i hire a company to construct a casing that i can affix to a toyota corolla frame so that the car looks like a rolls Royce or whatever but will run forever?
the car models can be whatever, I'm just curious if anyone is dressing up their cheap cars as expensive ones or if this is an industry yet?
is there a legal hurdle?
is there a limit to car decision in general?
is this sort of car case business already a thing?
Look up Kit Cars and other types of aftermarket mods. Usually it's an issue of getting the DMV to register it when it claims to be a Toyota but doesn't look like one. Roadworthiness inspections are expensive and you need to have exhaustive detail on everything.
Ultimately it costs tens of thousands of dollars to do, at which point it makes more sense to just buy a nicer car (for most people)
Some states are draconian and will never let you register it. Some states will go "OK, you got lights, a seat belt, and four wheels. You good, here's your VIN."
For your example, I think it'd be a helluva lot more practical to swap a Rolls Royce drivetrain out for a Toyota drivetrain rather than replicate a Rolls body onto something like a Corolla. The latter always looks like goofy shit unless both cars are similar size and shape.