I've realised that my previous post is actually not quite correct. Because the mirrored sheetmetal part is actually derived from the original sheetmetal part, it will actually use the original part's thickness to control it's geometry, not the sheetmetal style. Changing the style in the original part (and therefore the thickness) will also change the mirrored component. I still believe however, that the style of the mirrored part should match the original automatically to allow unfolding.
