tTo be honest, just adding two weights on to the car to run a li-po isn't going to warrant a new car design.
Have you actually TRIED to get enough weight onto a LiPo touring car?
It's a handful more than two weights, unless you're using dumbbell weights.
My "heavy" Mi3 with standard steel screw kit and a "heavy" Novak GTB brushless system, and a "heavy" excessive paint job on a thick rubber tire body is still about 90 grams
light. That's about 3.15 oz to you Metric-challenged. And I'm using a carbon battery strap to even add weight into the car as it is.
Show me where to put that weight in a contemporary luxury touring car chassis.