Step one start with the best looking slow car on the road, a first generation VW Karman Ghia. Step two place it on the frame of a WRX complete with all wheel drive. Step three place the power plant from the RX-7 super car 3 rotors of smooth power.
It will be the quirkiest thing on four wheels.
Although lately I have been contemplating this set up but with a Tesla power plant instead of the Rotary.