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Lotus Elise
As close to a motorcycle as any car will ever get ...
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The naked tub
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The rear of frame rails are curved inward.
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Detail of rear of left frame rail.
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Multiple simple extrusions glued inside each other instead of a single extrusion with a more complex cross section.
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The whole frame is assembled with glue, screws and rivets.
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Closeup of rivets.
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Panoz
also assemble their aluminum cars in a similar way.
Here
is an article in "Assembly" magazine from 2002 about that technique.
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