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Josh
0.4mm is 4 layers of coke can or one piece of this: https://www.balsacabin.co.uk/product/016-aluminium-sheet-4-x-10ins/ (or 0.016" aluminium, brass, tinned steel or copper from the model shop of your choice, there's no compelling reason to pick one over another)
I know which I'd prefer 🙂