As for the cars themselves, the Mercedes-AMG A35 saloon was chosen primarily for its shape: the base model is said to have the best drag coefficient on the grid. Meanwhile, RML says it has benefited from zero help from Mercedes directly. Plato sourced three road car shells – two of which had water damage from a river and a lake. RML dipped, took apart and scanned the shells to create its own CAD drawings, then rebuilt the cars on roll-cages via CFD modelling to create a slippery thoroughbred racing car with a likeness of the original Mercedes road car. Source: Autocar