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World’s first off-road solar car ‘Stella Terra’ succeeds in cruising from Morocco to the Sahara
(www.designboom.com)
This is a most excellent place for technology news and articles.
To some extent yes, they had to. The roof is as excessively wide and flat to give it as much solar panel surface area as possible.
It's just a proof of concept, the same techniques could apply to a nice looking car without too much range compromise. But they wanted to do something extreme.