The easiest/cheapest methods I've found are mirror plexi and mylar.
Mirror acrylic/Plexi is my favorite. Very easy to work with. Cut with tablesaw/circular saw. You can curve it without much effort, tight curves need some heat.
Even cheaper is mylar film. Ask at your local hydroponics store. Thinner than aluminum foil, but much stronger, I find it's best applied with spray adesive (I use stay put, it's used for countertops and is great in humidity and heat.)
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