... , Hemlock, Pine, Alder, Mahogany, Ash, Okoume, etc. 2) StructureA) if what you need is solid timber door, structure is like belowStile&rail ... 2 pieces of solid wood laminatedPanel: solid wood B) if what you need is engineering composite wood door, structure is like belowStile ... -joint wood + MDF + solid veneerPanel: MDF + wood veneer C) if what you need is flush wood door, structure is like below D ...