Construct a Rolls-Royce Cullinan that takes inspiration from the racetrack: Borrow the sharp, angular lines of a supercar's bodywork, a set of prominent cooling vents that adorn the side skirts, and a striking rear wing that signifies performance. Its paintwork should be a fusion of onyx black and vivid sunbeam yellow, resembling a gradient effect that accentuates its commanding form, situated centrally in a high-end, modern showroom.  --ar 1:1