good point on the glass thickness.
Just to provide more details on mine.
Glass is 9mm thick. I have a straight edge to measure the bow-out against, because I have inset eggcrate along the top. In other words. the glass bows out but the eggcrate edge doesn't. The gap near the ends between the tank glass (molded rim) and the eggcrate is 3mm. The gap at the center between the tank glass and the eggcrate is 5mm. The delta is 2mm.
ie my glass bows out 2mm at the mid point, which is not very much. On a similar 3 foot long tank with thinner glass (e.g. 33 gallon) you'll see a bigger bow than 2mm.
The molded rim on mine is also much sturdier than what's on smaller tanks (like the 33 gallon). The plastic layer itself is 3mm thick and the width wrapped around/over top of the rim measures 2.5cm
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