Depends how you are planning to make it.
CNC/manual machining.
Home powertools.
Or hacking at it with a hacksaw and a dremel..................
Materials suitable for the first, will not be so good for the last. Unless you have a million spare hours to use..........
Many manufacturers will use 7075 or 6061 sheet, either heat treated, or not, depending on their particular design philosophy (stiff or flexible chassis).
But these are a real bugger to cut manually. Or with home powertools.
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