Lots of interesting ideas. I should mention, that some of the more radical ideas of re-shaping the body will probably backfire, as changing things completely will probably ad more weight.
I suggest just keeping to the current shape, with minor modifications to the front facia. Mostly just smoothing things out.
The largest single modification that would make the car more slippery is smoothing out the bottom of the car. This could be done with thin aluminum sheet.
Now as far as reducing weight goes, like I said, the interior is pretty important and for a good weight reduction, a complete redesign with new furniture would probably do the trick. Aluminum tubes and nylon mesh are your friends.
Cutting out big squares in the floor and roof and replacing them with aluminum sheet might reduce weight further. That might bring unforseen problems though.
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