That does look like an interesting read, but reading the abstract, he goes a bit fanatical, in that he tries to smelt the metal himself. The metal industry (and plastic) is alive and well in Europe, you can buy prepared metal, wires, microchips, buttons and other needed materials easily, down to plastic beads you can put in a mold (or more likely, just 3d print these days), given these, I don’t see having a problem building a functional, albeit less aesthetically refined toaster in 2 days.