I believe that many reefers here are more concerned with the cabinet and a lack of a build in IOS to allow for a sump to be easily installed and contained. Think most people feel that the tank is not suitable for marine due to the lack in capability to satisfy the installation many of the equipments that allow u to maintain good water parameters. That's why u are having a headache about sump, about what skimmer to use etc etc. u wouldn't have to worry about these if ur tank was custom make for marine.
IMHO The thickness of the glass is not the crucial part as it will no doubt will hold for now. Long run, we may not know for sure, but i have not heard of glass giving way. Although it seems like it will be a big disaster if it were to happen.. leakage though seems to be a common issue. anyway the thickness is just a scientific research ratio that most of us follow.
What we are doing now is also to help find the best way for your tank to be sustainable. Which I think bro admiraltian has a good suggestion. I believe nobody would want to see new enthusiatic reefers throwing money down the drain with bad advice. So no hard feelings ya!