If your measurements are really on the money, it may be easier to simply build put down a panel of 3/8" glass instead of four strips on the bottom. The tank's height is the issue regarding bowing, but at 41" in length, I'm not convinced it couldn't be done with chevrons in the corners instead of full eurobracing, but I wouldn't have issues with eurobracing it.
Something to consider here is weight. 1/2" glass will make this one really heavy bugger. Aside from all the other planning, you should have extra hand around for setting the panels in place and then setting the final product in place.
"Why can't my wife see all of this stuff as an investment?"