I am imagining my world to have around Bronze Age technology, but with very very little metal tools. A big thing in this world are hill forts as every city of my two main races is a hill fort with wooden outside walls and wooden huts and buildings inside. Basically how did ancient peoples go about their logging and lumber industry? When exactly did actual planks of lumber start to be developed and used? Or, for a more ancient setting like mine, would all buildings, walls, etc, be constructed like out bundled sticks and logs rather than planks of wood? I hope I am making sense here, lol.