The electric atom uses the same motor in the Tzero. Its an AC motor that can use regenterative recharging during braking.
Im curious about the batteries. When I was planning my electric conversion I had issue with using lead-acid deep cycle bats. It seems that Lithium Ion is the way to go but the only ones that would work large scale are the 28v ones from Milwaukee Tools. The ones used in their 28v power tools. I was estimating needing 200 battery packs to give me about a 50 mile range and a recharge time of about 4 hours. Problem was that it would have cost me $20k for the batteries. The motor and drivetrain in an electric is easy its all about the batteries.
here are some links I found while researching:
http://www.evadc.org/build_motor.html
http://www.electricvehiclesusa.com/
http://www.evsource.com/index.php - This place sells the motors and the regulators
http://zapworld.com/cars/salecars.asp - electric cars for sale now
I am going with Biodiesel. I am selling my gassers as we speak on ebay. For now its much more economical for me than a full on electric. Believe me I researched it and I would have to come out of pocket at least 10K to convert my Ford Focus, using lead acid Optimas.
Good luck. I think it will be fun to see when done.