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Yes, the downside is that you aren't going to find a motor that is going to run on a 3.2 or 6.4 volt system and produce power in a fashion that is practical. The motors and controllers don't exist. I can't imagine what kind of wiring you would need to push thousands of amps continuously to produce any usable power if there was such a system.

72volts is about as low as most people who want to run a low voltage system will go. There is one guy who has a 48v AC system that seems to provide a decent amount of motor RPM but it's kw output is small and therefore not a very powerful system for anything but the absolute lightest of vehicles. If you are planning a series DC motor and want highway speeds you'd want something in the 45 cell or so range. With an AC system there are many satisfied with 35 or 36 100 to 200Ah cells depending on required range and get enough power to the point where I think its plenty reasonable for a car that isn't heavier than most conversions if the aerodynamics isn't too bad.
 
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