If one were not using panels on a roof, could you use the roof planking to provide a one foot(or more) overhang on gable ends or would you need to have some more framing(structural ) support for this, if so how is this accomplished? For clarity sake I am thinking in terms of a common rafter roof on a tie-below the plate-continouous top plate frame with rafters spaced at 4 feet, 1.5 "planked, furring strips, and standing seam metal roofing( no insulation, no sips). tb