What i think can REALLY help to ingest this type of data is to provide also some sample scripts to process data (like often you get examples on github for some code).
The idea of the Climate Data Store is to have a computational layer on the cloud which allows a simple manipulation of the data close to the data and thus avoiding large download. There are a few examples on how this can be used to develop your own scripts here: https://cds.climate.copernicus.eu/cdsapp#!/toolbox
