I redesigned my little plane, it’s a bit longer and the wingspan is increased. The rear part of the fuselage could be made of carbon. It is symmetrical, so 1/2 mold is enough.
I suggest this attachment for the upper rod end, it is screwed over its entire stem length into a threaded tube:
To keep the rod end in the right position, I suggest holding it with a small blade shoved into a block of rubber, which allows the rod end stem to turn slightly when the wing is raised too much during the folding. So there is no risk of forcing it:
Titre du site 
I like your concept very much, Laurent. The vertical tail volume (area x lever arm) does seem a bit small, I wonder if an H-tail would actually suit your design better? The twin vertical tails would act as end plates to make the horizontal tail more effective and the elevator would become a simple rectangle.
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On my design there is 2 small end plates at each side of the elevator. Perhaps you are right 2 vertical stabs and rudders would be better? Is it not difficult to move 2 rudders?
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