Because you can't shape the car any way you want, you have to fit all these things in, while still being bound by box-like constraints (for driving on normal ro

Because you can't shape the car any way you want, you have to fit all these things in, while still being bound by box-like constraints (for driving on normal roads, parking, stability while turning, etc) and having to be slightly elevated to drive over bumps and small rocks. It's pretty damn hard to build a practical and safe car with a very low drag.