There's a huge difference between buying a tank with laminated glass versus trying to make it yourself.I have a 310 gallon tank that was made by oceanic with 2 layers of glass to make the bottom panel.
I'm not exactly a new tank builder. Very mechanically inclined and i have built smaller aquariums. Diy king joey shows how you can repair a tank bottom this way. I figured preplanned and controlled could only mean a better outcome. The panels I have are 5/8s thick and it would be trimless right on foamYou are asking for trouble if you do that. That is a large tank for a new tank builder to begin with. Add in something like that and you are going to have wet floors.