This would be my most buildable concept: Supereliptic Morelli body with single-speed Toyota HSD axle.
http://ecomodder.com/forum/showthrea...tml#post562058
The Lexus axle is 18" across so you could attach wheels directly without axles and get a narrow rear track. If the front wheels are held within the maximum width of the teardrop body, there will still be turbulence flowing down the sides. I think it might be better to move the front wheels forward and out for a stance like this Beetle:
The superellipse can be as close to square as is needed to accommodate the solar cells and flat sheet materials. And as curved as possible
for crosswind performance.