all reclaimed exterior. neighbor up the street threw out his old fence.  i road each 8 foot long section down the hill on my skate board.  then de-nailed the entire runs.  i pressure washed it for a week, maybe two.  then i re-sawed each board into the sizes you see in the pictures.  then nailed it to the side.  some are set at 45 degrees to act as both light slits and ventilation.