No, it has to look like a car, of course.
Maybe safety cell is the wrong word, but a chassis like todays rally1 cars, standard piece from a producer of choice from FIA, with a approval for use on road as a car for competition use.

Rally2 engine, gearbox, diffs, dampers, brakes etc.

Every serious tuner, like M-sport, prodrive, toksport, Weavers, etc can build a car and run a team, free of choise what kind of car, but limited to critical measurements on roof, width, length, windscreen, spoilers etc.
A way to build a car that is affordable for tuners, importers and teams.

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