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: