Abstract: A horizontal joint between upper and lower building panels, as well as a building wall including such a horizontal joint, in which a liquid diverting arrangement includes a gutter with first and second ends and at least one aperture disposed between these ends. Also contemplated are a method and apparatus for forming at least two building panels, in which the panels have different reveal dimensions, and a method and apparatus for forming a building panel in which a first reveal portion is registered while a second reveal portion has been formed at a preselected distance therefrom. Further contemplated are a method and kit for customizably assembling a building wall, in which panels having different thickness dimensions can be interchangeably connected with one another, as well as a method and kit for customizably assembling a building wall, in which on or more decorative profile panels and one or more structural building wall panels can be interchangeably connected with one another.