Dave,
"In a "sides on bottom" tank, the entire bottom surface of the tank is supported by the stand, allowing the use of a thinner bottom pane. In the case of my build, the savings were substantial."
I'm trying to understand what you mean by this as either method the bottom is fully supported by cabinet unless the sides are extended down for some reason.
Jim
A "normal" sides around bottom tank sits on it's rim (made up of the side panels), and the bottom pane of the tank is raised slightly and therefore not supported. Any AGA or Oceanic tank would serve as a good example of what I'm talking about with this style tank.