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Why bother replacing the parts you put in? Just rip out anything you don't need. I pulled 200kg from my old BMW M535i just by binning what I didn't need and replacing the front seats with 7kg fibreglass bucket seats. If you really want to keep the parts, you could try 1.5mm vacuum formed Perspex. It's lightweight, available in many colours and can be painted on the inside with a great finish, but it's not very stiff.
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