As far as costs...
The control units are still pricey because there are only a few that have hacked the tesla motor controls. I think you can find stand alone for ~$3000. You can find used (salvaged) Tesla motors for ~$3000. There are also companies that will get the used motors and the controllers and test them for you prior to shipment (this is what I did).
I have not purchased the batteries yet. I am still trying to decide between used Chevy Volt battery pack and new LG Chem 16S 2.6kWh batteries.
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