A "teardrop" camper I started years ago.  Teardrop is in quotes because most teardrops are based on a full size bed and are thin walled and super light.  I wanted a bigger bed and better construction so I took the concept and designed what I wanted in Autocad from scratch, starting with the frame.  After building the frame, the deck, the walls, etc, etc.  it has been a fun project!  All exterior surfaces are insulated and it is heated and cooled.