My long, narrow house will have all of the plumbing along one section of one side. Below are my isometric drawing of the DWV system and the relevant part of the floor plan. My vents will go up through the interior walls and then join into one that will exit the gable end so that I can avoid any penetrations of my standing-seam steel roof, as the house will be all electric. Please critique my plan. I anticipate that I may have an overabundance of cleanouts; which, if any, are unnecessary? Have I followed the rules of isometric drawings adequately? I'm governed by the 2012 IRC.