Again, beautiful work Alex. I myself found that in designs such as this (I collaborated with AC Glenn on the "Ariel") the fuselage starts to become a flying balsawood forest. The surface area of such fuselages becomes an immense number. My latest fuse design project is showing a surface area of 1.471 sq meters (with canopy but no rudder). Creating the sub structure with enough minimal integrity for building and a skin that will carry most of the flight loads is a daunting task in designs like these.

-Mark