CESM1/MESSy (geosci-model-dev.net/9/125/2016/) regrids import data online, using SCRIP, which requires the grid corners. These are available on yellowstone, e.g.
but are missing for the new ne5np4 grid. The tool HOMME2SCRIP.ncl is used to generate them, but I do not have access to that either. If you can point me to the right person who generates those files I would be grateful.