i think your shapes are becoming more sophisticated. i bet your car looks much like Gordon Murray's new city car but with 4 seats. since the car's length is determined by the wheels/bumpers, i think there could be a bit more metal over the rear wheel for trunk space without adding any length. that's about the only think i could see that i would consider.
btw, hi 2o6! it's been awhile. hope your summer is going well.