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Goggling Google's results for "dune buggy curb weight" it looks like 1000-1400lb, although I remember claims as low as 800lb. Consider the differing requirements for a drag racer (minimal) and off-road racer (maximal).
They appear to use a large thin-wall aluminum box tube in an un-triangulated structure, If I read their pictures right. You couldn't just leave the top tube off to make way for a door, the thing would collapse.
But they have an interesting design management process, scrum. Maybe that would allow them to accommodate the changes that would reverberate through the rest of the car if doors were added.
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