Sounds like a euro braced tank from your description and it's not advisable to remove that bracing. Try to find out some additional info regarding the tank, brand perhaps and particularly if it has any tempered glass. Since you haven't put water into it yet, you might consider having the tank drilled, hence the reason to see if it's tempered. If you can get it drilled (or drill yourself) your overflow problems would be solved fairly easily.
It's a nice size and I've seen some of the 'Osaka' tanks with the rounded front edges yours has and find this feature kind of attractive actually. Also two fewer silicone joints to fail. Not sure what drawbacks this has, if any, maybe difficult to clean the inside round corners..
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