Honestly, I don't know. InterAmerican tends to overbuild their aquariums for strength so I guess it's for extra protection. I think he mentioned that they brace width if the tank is over 18" wide.
I think you would be fine at 1/2". I think the majority of the bracing is just the leftover from the tank construction. they will brace whatever they use to make the tank.
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-=Bryan=-
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