Re: 36 five window interior panels
Google “upholstery panel board” and you’ll find what many people use. It’s waterproof and about $15 for a 32” x 48” sheet. I think it’ll be easier to to shape and cut than Masonite, and it’s a much closer duplicate to original panels. I always back it up with plastic sheet that I glue to the backside, because I’ve had issues with it warping slightly when water gets into the door.
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