If you're doing wood you could make a template out of cardboard to get the curve, then cut the wood and use foam body tape underneath to cushion it, keep it on and make up for any imperfections in saw work. I know on long curves it can get a little wobbly!
Also there was a Toyota Sienna boat tail thread awhile back that said it's best to enclose the rear. It might not be worth trying to find the thread though, since the opening you'll have will not be very big.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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