Pretty friggin neat man! Have you considered using an industrial dumpster as a starting point? That looks about the size you're at now... you could have cut it up, added some framing at the cut lines for rebolting it back together...
Ya i often thought of using dumpsters...its been done before. Too much work to hack it all up and i had the steel left over from a previous customer. If i had a warehouse id just have a half dozen delivered haha. My tanks dimensions 14'x8'x4' so a dumpster that size is more of a shipping container. Too tall to get in my house.
Much respect on an original build though.. looking good.
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