The white paper of the Giant Radio Array for Neutrino Detection (GRAND) is finally out on arXiv:

The Giant Radio Array for Neutrino Detection (GRAND): Science and Design, 1810.09994
GRAND Collaboration

I was editor and contributor of this paper — I am part of the GRAND Collaboration.  Being editor demanded considerable time investment.  So it is personally very satisfying to see the paper finally out!