Your goal is to have a walk-around? The idea is very cool but something I'd personally only do with a 6x6 footprint or bigger. You're building a tank with such an awesomely wide footprint but then you more than chop it in half with the overflow there. It's a real commitment. I'm sure you can hide it with rock but then that encroaches on your space even more.
That might be just me though. I'm sure you'll make it happen right.
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