RE: Twice the scale, now how about the motor?
The general idea is that if you double the linear dimensions, both weight and power needed will go up as the cube. An application of scale effect, or the square-cube law. I can't think of the name (starts with a B) of the airplane design which has an airfoil shaped fuselage with twin tail booms, stab and elevator, and regular wings. That would be something to think about for weight lifting.