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I would just have nice sturdy flanges cut from aluminum, and weld strips of sheet at a width equal to your desired height and then use them to fabricate the walls and top or lid of your spacer, rather than try to machine it from a solid piece of aluminum. As mentioned above, such a piece would be outrageously expensive.
edit :: you could actually then make the "lid" section any shape or dimension desired. The flanges would be relatively cheap, and you could just have 5 or 10 cut. if it only took 3 or 4 to figure out your design, you'd have a few left that you could sell. of course that is assuming that you have the means to weld aluminum, and that there would be a market for them. But it seems like it could be a fairly sought after item if the intake isn't one of a kind. Sorry just skimmed over the thread but wanted to try and give some helpful insight.
edit :: you could actually then make the "lid" section any shape or dimension desired. The flanges would be relatively cheap, and you could just have 5 or 10 cut. if it only took 3 or 4 to figure out your design, you'd have a few left that you could sell. of course that is assuming that you have the means to weld aluminum, and that there would be a market for them. But it seems like it could be a fairly sought after item if the intake isn't one of a kind. Sorry just skimmed over the thread but wanted to try and give some helpful insight.