For those interested in cheap, durable, and semi-presentable lensboards, I've had good luck making them from composite flooring material like Pergo, (though I use a cheaper brand without the foam backing). It has a nice wood finish on one side, and won't warp. I made a bunch of 6x6 boards at around 50-cents each, and if someone local needs one, I'll trade for a beer and make a healthy profit!
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