Hi Ron,
I work in a TAFE and the bookshop there sells plastic folders for the art students to store their work in. It looks very like kydex to me and I have used it in several projects. An art supply store probably stocks it too. You just remove the stitching and cut it to size.
However, for an upper cage I think a better option is thin plywood. I got 1.5mm ply from a marine timbers shop. I believe doorskins have been used too. The ply is much stronger and doesn't distort in the heat.
Rod.
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