you may wish to check out ebay.co.uk, as boxsters there came in lower spec than in 'merica. you'll finds lots of inexpensive door panels (called door cards there) many without speaker cut-outs, and many without side airbags, for that lightweight build.
ps, been looking into this and partway down the road on my build - going to delete the cubby covers as well (easy) and replace door openers with straps (hard; requires relocating the microswitch that drops the window). end product will be as light as anything you could make from scratch.
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