My initial criticisms: Air Conditioning is an upcharge -- how much? (It is essential in many regions). And how much does its use affect range? Similarly, how much does the heat affect range? (probably resistance heat- the least efficient type?) What is range in winter, or summer?
What about safety - crash tests and occupant injury - what is the result of a 20mph head-on collision? Side collision? Roll-over? Does the "savings" of a cheap car translate into life spent in a wheelchair as a result of a minor fender-bender?
The 25/40mph top speed is severely limiting in terms of usefulness. Perhaps city-only use is the only domain?
Each battery pack gives 25km range. 2 standard, 4 max. What is the cost of additional packs? What is charge time? How many cycles per pack?
Seat belts? Passive restraints? Is there even a spare tire in case of a flat?
Taxes and Insurance - what is the vehicle category and how does it compare?
Again, I hate to be a dark cloud over this project, but to me a $5000 used gasoline auto seems to be much more practical everyday transportation.