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The screws used in the walls are #6x 1" SS panhard screws x 4 per side, counter sunk, so they are pretty deep. With a heavy lead acid battery, it should hold up fine. 1/4 SS bolts nylon insert nut, neoprene and SS washer fastening it to the deck. If you wanted a more robust box, use 1/2 HDPE, you could sink some pretty hefty screws or bolts threw that. IF my shop was not a mess right now, I would redo this on the router table using 1/2 HDPE and dove tail to hold the box together.
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