I have mine setup exactly the same as your drawing. 2 cross braces on both sides of the overflow is enough.
Im guessing youre doing a bean overflow. I would put the 2 standpipes higher to have the top caps near the water surface. You'll need to put an airline on one of the standpipes.
If I was to do it over, I would build an external or coast to coast overflow instead of the center internal overflow to get more tank space to play with.
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