As I mentioned, email Jim Marske and ask him.Op. Do you have loads determined ? If you could give me, i would design it in two variants - only shell and only tube. For tail section only.
As mine numbers shown already - it is safer and faster to make a shell and add only local reinforcements against buckling of large panels.
Tubes are nice and sound (done using pultrusion or other high fiber epoxy ratio), but joints are not..
One of example :
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