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Caro Daniele
Your essay concentrates on quantized space - but should not the building blocks of space be the also the same as those making up matter?
In a recent post above you said "As a general remark, I do of course agree that a theory that explains gravity at a more fundamental level, which is what models of quantum space or related quantum gravity models try to do, and that in addition explains electromagnetism (electrostatics is not enough) and possibly other interactions (i.e. nuclear ones) would be better than one that only explains gravity. Unfortunately, I do not know any such complete theory yet."
I have presented just such a theory but it is incomplete say the least. Moreover for my model to function some basic notions of present-day physics (specifically GR, the notion of flexible space-time, the point photon, and of quantum probability) have to be reconstructed or reverse-engineered to a common and simpler theory - In my 2005 Beautiful Universe theory on which my present fqxi paper is based, a universal lattice of dielectric building blocks store angular momentum in units of h and transmit it to neighboring nodes. Gravitational potential (density) is caused by the rate of rotation of the nodes, and the pattern of twisting of the axes of rotation in the lattice. I would highly appreciate it if you can look at my ideas. They would only work if professionals like you pick them up and work out the details!
With best wishes for your success, Vladimir