Looks like you have a lot of work to do to this thing. Any stats on what is under the hood, um "bonnet"?
There is almost an unlimited amount of variables that you could consider for this, because of the stripped down construction of the Locost. I personally like the image overlay in the first posting, but with a 'slightly' longer back end. Closing up the front fenders, like on the Aptera is another avenue you could take.
If you are limited to $2000, but are doing the glassing and bodywork yourself, I think you could make one hell of an aerodynamic vehicle worthy of 100 mpg. I look forward to more posts