how thick is your tank ?

[toytech]

So im thinking of building a 50 gal sorta cube 24x24x20 tall and i was originally thinking of using 10mm glass and going rimless . Now that ive got a few quotes for $500 plus im now thinking of using 6mm and eurobracing it (would be $130 and i can polish it myself). So whos got 20 tall tanks and how thick are they ?Or whos building tanks and would you use 6mm for something like this ?