Quote Originally Posted by Fast Eddie WRC View Post
Wiki
"Tubular space frame structures are permitted allowing for scaling of production models."
It was one of the reasons, sure. But it's wasn't "really only brought in so new manufacturers could enter and re-size their relevant car model to fit" - the primary objective was to make the cars safer, both for the occupants, and the hybrid system. Chopping up standard road car chassis to turn them into rally cars will never be as safe or purposeful, as building a spaceframe from scratch.