After calling around some, it looks like this can't be done in aluminum. People are quoting around $1000 or more and they said it can't be welded together, either. Also, to make it out of a solid block of aluminum wouldn't allow for squared corners.

So I would either have to have it made out of plastic, steel, or something.

What are tolerances for welding? Is 2mm too thin for any material to be welded?

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