Why not just bend the aluminum into 2 a U shape? Meaning 2 walls and a floor, then weld up the two other walls, and bolt down the top?
[_] = this shape with little sections on the top... then you can have the top be riveted or bolted, and removable like in some fuel cells if you want to redo something, w/o the risk of cutting it back open.
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Rotaries:They are NOT that complicated!
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