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Here's a wire of the base.  All of the cappellini S chairs seem to have this same base, some with, and some without the stoppers at the bottom.

Airflamesred, in the virtual model, the weave consists of a meshed spline object, seperate from the frame border.  However I imagine, in fabrication, this would be made of metal rods, welded to a molded metal frame, then coated in a thick plastic/rubber polymer (kind of like electical wiring would be).  It could be further coated with, say, a bamboo shell, leather wrappings, or some kind of material for aesthetics.

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