That is fascinating! If I decide to revamp my 65 gallon riparium, which does have a center brace, I may remove the top rim. I think I would put glass triangle braces in the corners though just for extra safety.
Yes, I will do the triangles to in the near future, when I have some more time.
I'd personally still want to put at least a 1/4" thick center brace about 3" wide (glass) on anything that comes from the factory with a center brace. Somewhat annoying but can be done nicely.
And yes, I will do a glass center brace just to be sure