anyone make their own door panels???

Yup. pretty classy...believe it or not, somebody did this to a 1968 GTS convertible...

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If it's stupid but it works, is it still stupid?
lol "doorskin" plywood. Door skin for HOUSES!
It bends easily enough, it's easy to cut with a boxcutter, light and stiff for it's thickness. I've used it for making molds at work.