Beauty is in the eye of the beholder

The drag coefficient of the Prius is .26 which is much better than most cars. Personally, I like the look of it.
I do understand your point about many electric vehicles. A large part of the reason, imo, is that most people that tried to build EVs started with what was available. Golf Carts!
Few companies outside of the Detroit 3 actually had the cash (at one time) to gamble on new technology and do it from the ground up.
Tesla took the plunge and came up with a beautiful looking Roadster and their Model S is looking pretty darn nice as well.
The Volt is a bit 'blocky' for me, but it is a heck of a lot better than a golf cart

I think you could build a highly efficient vehicle under 25k. But once you mention
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" make it plug in, coat the roof sections with the latest paint-like photovoltaics and use latest biodegradeable battery technology,"
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I think you toss the sub 25k pricetag right out the window.
Someday, the price of that will come down, but I don't believe you could do that anytime soon.