eLuSiVeMiTe
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Was going to suggest ply behind. Angle grinders don't like itI'd bang it out from a bit of 2 or 2.5mm with some strategic folds, then seam weld the corners, no frames or messing about with frames.
Plywood is a common way, throw in a sheet of expamet too, that plays havoc with discs and blades if it is rattling around loose.