for your simple "I want just to build it approach":
1 Make a plain test piece of a 25%/50%/25% (0°/+-45°/90° direction).
2 Measure the tension stiffness of it at compare it to the tension stiffness of a aluminium plate.
3 Use the stiffness ratio to scale the skin thickness (e.g. if the CFRP is twice as stiff you need half the thickness
4 build the mast with same outer shape and the found skin thickness

The mast will have the same bending stiffness, but not the same weight, strength and so on. Other layer set-up will give lighter masts and varying the skin thickness over the mast length would just be another parameter.
It will not be "first time right" if this is the first mast you build and by the way, a shorter mast need to have a lower second moment of inertia to have the same bending curve. If all these expressions are greek to you, better buy a mast. It will be cheaper (you forget to mention this specific point of nay saying :))
Seriously, I can't give you more detailed numbers, as I don't know the skin thickness of the super wing mast and which sort of carbon and resin you want to use.


Cheers,

Klaus