Maya is still in Maine and I have been taking advantage of the good weather to make progress on the tiny house.  After completing the wall framing on two sides of the house I began installing the remainder of the drain pipes and the HVAC mini-split refrigerant lines (covered in black foam insulation). The latter are often run on the outside of the house inside a bulky cover. Routing them inside the walls is much more aesthetically pleasing but a lot more work. Pictured above is the arrangement I came up with for the washer/dryer drain, kitchen sink drain, HVAC condensate drain, and stack vent.