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I am not quiet sure what you mean saying 1 wall.
The wing wall thickness is 0,5 mm (1 perimeter/1 line)
The fuselage wall is 1 mm (2 perimeter/ 2 lines each 0,5 mm)
I would extend the wing span to 1 m at the most. Then you already need longer carbon tubes and you have to enlarge the elevons as well.
It will also increase the weight and may need a stronger motor.