Metal is fine. You won't be bothered w/ wood borers. You can budget-insulate w/ fire-rated polystyrene of the stud thickness stuffed between wall panels. Just prep areas where you might wanna hang or attach heavy items. If you need to randomly hang light frames, check for the proper drywall anchors like those in pic for your desired application. You could space your vertical studs 16"oc instead of 24", should you want sturdy, sir.
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