What delightful background! How very colonial Estalian as well. Excellently crafted as always. Do you happen to have anything more in store for Altos Aires? 
Also, what coincidence met me here: I was just starting to catch up on long-planned tasks on CDO and reading through background topic notifications half a year old. I had just posted a story for an artwork by @forgefire , written in raw format during 2017 and finished today, which feature the pampas of the Culchan Plains. And the first background topic in the list I then stumble into happens to be your wonderful background for Altos Aires.
It must truly be the will of Myrmidia. Praise be to the Goddess! Set sail!