Not that I know of. I know that GARF.org does long shallow tanks. Theirs are made of a sheet of greenhouse covering. Starts as 4x8 but they make a box without a top (by scoring the corners and folding it up) that is 2' x 6' x 12". Those sheets are like 30-50$ The double layered kind, like corragated cardboard.
Good idea though, just maybe a little wide
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