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Hi Daniel
Many people use a thin black plastic to line the inside of the secondary cage. However thin ply is structurally stronger and doesn't warp in the heat (like in a hot car).
If you use a thin ply, then look for 1.5mm thick ply. You can get hoop pine ply that thickness from plyco but the sheet size is probably far too big for you. I believe some hobby stores stock thin ply in small sizes but I have never bought it.
I have used black plastic art folders which are quite cheap.
Hope that helps.
Rod
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