it doesnt have to be exact 1, 1, 1, 2, 2 ,2, it could be 1, 2 stone, 1 iron, 1 steel, 3, 4 stone, 2, 3, iron, 2 steel.
just something where I dont skip levels 1-4 of a material because the 5 or 6 of the prior material is still better.
no, scrapped lead and brass were in the game before...