Well, since the thread was revived, I'll drop my 2 cents worth... You want a light car to convert to electric? My choice would be a Dodge Aries K. Very lightweight, quite roomy for its weight, they're extremely cheap to purchase, seats 6, and has a good size engine bay and trunk to stuff with batteries. Plus you can put some Aries wagon springs in the back to counteract the weight of the batteries.
I'd prefer an old RWD Corolla, Supra, RX7, or Miata.
I only mention rear wheel drive because if you opt out of the transmission it is much easier to do. Plus, you also have more options as almost anything can be used for a gearbox since it has only one output shaft instead of needing the fwd transaxle.
But for 300 pounds more the Aries K is a lot roomier than the Corolla, and has a much larger trunk to store batteries in. You're comparing a midsize Dodge Aries to a compact Corolla. Taking into account the larger car, for 300 pounds more. The Aries had a nice size trunk. Pleanty of room for batteries, and still have room for a few bags of groceries.