When we cut glass, it doesn't always work out as planned. There are some cuts that are so complicated that we have to take them to a professional glass cutter. The best example of this is our one piece euro bracing. Part of the cost of these cuts is the risk that the glass will break. If it does break, the glass cutter will redo the cut, but we have to supply the replacement glass. There is also considerable over cuts on a one piece euro needed by the machines while working on the center cuts.
The point is, glass breaks. We assume the risk when building a tank, but would never do so on a prebuilt tank. Part of calculating the cost of a custom tank is the risk of breakage. We have lost money on tank builds due to inaccurate cuts, scratches and breaks.
Nonetheless, I think a 1.5 inch overflow will work fine. If you put a wave box in the tank, it's pretty close to ideal.
- Brad
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