Ummm,
the tube has definitely a release agent inside. If there isn't this would not just peel off:
Also, the tube is not a hydrodynamic shape. I mean, all fuselages are at least a bit shaped in that way.
When you drill a tube for M6 inserts, the drilled hole is not round, it's slightly oval on top. The compression when bolted is immense and the hole started cracking on sides. With added torsion that would break in no time, if not wrapped for torsion heaps.
How much torsion is on the fuselage?
airsail:
from my model making experience, when wrapping a tube,
the carbon must be tensioned. Have a look how sail masts are built. With this sleeve, we can't tension it since it expands by the design. Only epoxy is keeping it not to expand. No go.
fsf:
Plenty of 316 8mm around. But why 8mm? Is this for the mast?
I used ash, but it's quite soft wood. It turns perfectly in the lathe tho, as any soft wood. However, resorted to hard wood since heaps better for mast/fuse connection. At least 5 layers around the mast in all possible angles.
Shaping the wing slot with a chisel takes, ummm, 15mins? With no previous experience.