Aeroply

Repeat your Google search for "Aero ply" or even Aero-ply. Try also "flexible ply" and "flexible plywood"
 
IIRC the ply I used years ago for aeroplanes was 1mm thick, Robbins Timber offer ply 1.5mm thick, quite expensive though. I would have thought that a thicker ply, say 3mm, would be better, and cheaper, for the job.
 
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