I would also recommend checking out the EVDL to see what others have managed with this car. Don't look at their conversion cost necessarily, but get an idea of what the parts (controller, battery weight, charger, etc.) can do, and then price them out yourself (check eBay, the various EV resellers, and the EVDL Tradin' Post). That should give you an idea of what you're looking at.
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Basically, for a freeway-capable EV, figure $750-1,000 for the motor, $1,000 for a Curtis 1231C 144V and $750 for the charger. That's just the base cost, not including wiring, battery racks, adapter plate, contactors, DC/DC, beefed up springs, etc., and not including batteries. If you are planning a city-only car, then you start with the Forkenswift design and go from there.