I tried a Saab 900 from the Google SketchUp 3D Warehouse -- and it was way too wide.
Here's CarBŒN Mk 2.6 with the Smart windshield lowered slightly and sloped back very close to the angle used in the Smart; in other words less vertical. I have much improved curve on the roof; though the flare at the base is necessarily bigger. Here is the view set as close to the original blue Bionic model for comparison:
Different in several ways, and similar in others. The blue Bionic has more creased chines, a little more hood and steeper windshield (in my estimation) and the sides are quite different. The rear wheels strakes are not joined with a panel, and they are closer to the ground.