En profil the Z4 Concept looks short and a little bit 'chunky', in other words: not very sleek and elegant looking, what you should expect from a classic roadster...
...that's why I overlayed the Z4 Concept over the E89 Z4to compare the both. I scaled the Z4 Concept down, based on the 20" rim.
Lengthwise both are nearly equal. Only the wheelbase and positioning of the wheels are different. The overhang on the front and the lower windscreen seems to change the proportions of the car.
