Just a suggestion, home depot sells a product called frp , fiber reinforced panel, same stuff they use to skin RV's nowadays - also used on car wash walls, its thin, its light, and if you use a polyurethane foam under (ie greatstuff) it makes for a near bulletproof composite panel...I've had some good results by tacking down the frp using greatstuff to fill with a 3mil poly backing to keep the inside neat...
With a little heat the frp bends relatively nice too (but watch out - too much heat melts it, and its a royal pain to fix the finish after melting)
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