We are super excited to see that Otmar (of Zilla Fame) and Deb over at Cafe Electric have had some great success hacking a Tesla S. They are in the middle of building a stretched Voltswagen Van using a salvaged Tesla S as the power train. Proof that really anything can be done.
Several years ago, a group of friends decided to build an electric car. More specifically, we converted an old Ford Contour to electric by replacing the existing gasoline motor with an electric motor and the fuel tank with batteries. 
Rather quickly we realized that a major obstacle was convincing the various computers within the car to not be upset after its engine had gone missing...
