Not sure what you mean by "pure aluminum," but I suppose it depends on the look you are going for. If you were replacing your interior skins with an aim of creating a shiny aluminum interior like the CCD models, then you could do what the factory does, and buy aluminum sheet that is already plasticoated by the manufacturer. This is some crazy expensive stuff. Or, you could buy uncoated aluminum alloy (I think I used .040" 5052) and try to clear coat it (not recommended--what a PITA). An uncoated aluminum alloy interior will show every smudge, and fingerprints quickly become permanent.
I suppose best recommendation would be to buy 2024 T3 Alclad for its corrosion resistance, but this, too would be an expensive option.
I've never seen an anodized aluminum interior--might be cool, though.
good luck!
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