I wouldn't go for wood, at the end of the day you'll run 3 to 6 GPUs running at least at 70 degrees with a PSU pushed to its limits, I'd find it dangerous.
Checkout this example: http://www.cryptobadger.com/2017/04/build-ethereum-mining-rig-hardware/
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i have been running on wood for months and i found nothing dangerous yet. ive seen plastic crates melted for some people.