[Blue Bomber Man]

If you are custom building your own chassis I'm sure you could get under 1500 pounds if you pushed the envelope enough (Including drivetrain and batteries). If you really want to be cost effective I would size it similar to a Mazda Miata. The weight and reduced CdA will help substantially. Even better would be 3 wheel design to get around most regulations to register the vehicle.

Keep in mind that Aptera's 3 wheel vehicle has a very low Cd of about .13 if I remember right and I'm sure it's weight is around 1100-1300 pounds. Their battery pack is something like 15kw-hours or more for a range of about 100 miles I think (just grabbing numbers from memory). So if you are less aerodynamic and heavier you would need to adjust your battery pack size or range expectations accordingly.

Good luck!