Volkswagen Rabbit. There are many EVs based on it out there, kits are available, and even a book telling you how to do it. Check out Convert It:
Amazon.com: Convert It! (9781879857940): Michael P. Brown, Shari Prange: Books. There is also a kit available for the Porsche 914, but they are rarer and more expensive. You can make a great sports EV out of one, though.