Thanks Mike!
Yes I have a 72 G bowfront with custom sump in my stand. I purchased the entire system used from a fellow canreefer and am quite happy with it. The sump is the equivalent of approx 25G and I can get the dimensions if you'd like. However.... it will not solve your dilemma. My stand had to have the center wood brace removed to install the sump. Previous owner did not have any probs and neither have I! There is some "side extensions along the back that takes some of the weight too. Not sure if it helps at all.
Here's some pics. Sorry I don't have any pics of the backside but it looks much the same just not bowed
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45 Gallon Cube with 10 Gallon Sump, Lighting 8 bulb T5, Vertex IN 80 Skimmer
-2 Occelaris Clowns, Engineer Goby, RBTA, Peppermint Shrimp