The top of the canopy (made by a sail plane builder - can you tell?) is probably just over 4' high - and its the apex on a very sleek dome. Improving the Cd by 0.01 would be much more meaningful.
That looks like a 14" Honda rim to me? If so, the tire would be about 2' and the apex of the canopy would be about 4'-3" above the ground.
Here's a photo with three people (one short, one average, one tall):
Here it is with some school age kids:
These people are bent over to look in, and they are still taller than the car:
I had a long Skype conversation today with Gary Krysztopik (who is building the EZ EV) and he has seen the Trev in person, when he hosted the Zero Race team at his house - it was parked in his garage, and he says it is a tiny car.