The cross sectioned picture looks a bit like stackable "tin-ware" pans I remember seeing in my Grand Dad's cluttered shop, about 40 years ago. He used them for storing odd parts - nuts, washers, etc. The wire rolled in the edge strengthened the otherwise very thin sheet metal. I recall them being made of a blued steel, presummably for baking, and I vaguely recall a sort of diamond embossed pattern on the bottom, and maybe sides as well. The angled sides allowed them to be stacked when empty. The sheet metal was literally folded at the corners, like paper. I don't recall exactly how the corner "tabs" were fastened, and I don't recall any rivets or washers, but the wire was visible at the 90-degree corners where the sheet metal didn't cover it. They were about 12 x 25 cm, as I recall.
I don't recognize the other pieces.