I do agree. But - even if omega shape is best at load/weight ratio. Square one are only 7% worse. If i do remember.Yes the method illustrated at the bottom was the first one I thought of.
But I believe, based on my little experience, that the Ʊ (omega) shape is difficult to obtain with carbon skins that do not willingly accept to be folded at excessive angles.
It could be made in glass or prefabricated in sections of sections to be previously inserted on the tubes, to then be glued on the tube and on the carbon handkerchief.
Now that I've understood the method, I actually think it's the best solution.
And as i have made on big post here, as asked by one person : https://www.homebuiltairplanes.com/forums/threads/tube-construction-alternatives-to-conventional-welding.27418/page-13#post-500148
Steel tubes are big yes. They are ready made, and have stable "performance" Caron tubes to mine afaik - are best if used as a tube - ie pushrod/tail tube etc.. Joining them is not that i would like to test with mine butt.
Dry fabric can be shaped as you want. So - why not to take our minimum number of layers, add to them reinforcements from saved truss weight. It is just easier. Truss made from tubes is need only then we do not need any skin. Like in space (Where they are used.. )
Ps. If someone will told me how easy is to made free formed composite - i doubt if they now how nice does it feel on your nose/skin this experience Will add new description to my avatar.