If you take the Edison2 VLC 4 seat chassis, without it's engine, it weighs about 730 pounds. The 54kWh pack I'm showing (768 EiG cells) should weigh about 900 pounds, and the electric motors and controls another 250 or so? About 1,900 total?
Weight is not super critical -- the Illuminati Seven weighs ~3,100 and it goes 200 miles on just ~32kWh. The FVT eVaro goes 120-150 on it's 21kWh pack. You can regain the energy from weight two ways: coasting, and regenerative braking.
Aerodynamics are most important for good range. Aero drag is a total loss -- there is no way to regain it. So, the aerodynamics of the CarBEN are the most critical to me. I'm hoping to be less than Cd 0.15; and maybe even as low as 0.12. The frontal area is about 25 sq ft, and because it is more or less square in section, that frontal area yields a lot of usable interior volume. It is not a whole lot bigger than a Smart, and it fits 5 people instead of 2. Here's an older version of CarBEN compared t o a Smart.
I am now using the Smart's windshield in the CarBEN.