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Very good point about safety! Here is a guide I used: http://www.1001pallets.com/
I live in Malta, I do not dry the wood except leave in the sun any pallets that have been exposed to rain; haven't had any problems thus far. However I took wood shrinking/expansion into consideration by not fixing any supports/beams/reinforcements/etc across the vein, but only along the vein. The only exception is drawer railings which had to be fixed perpendicular to the wood vein direction.