First of all, thanks Serafina for starting this very helpful thread, and to everybody who contributed! I had my appointment today, and left happy with my precaria in hand, but I was given ten days to come back with an translation of my passport, by a certified translator from the Colegio de Traductores Públicos. I had no idea this was necessary, and it is not written on any of the sites or brochures that list the documents that one has to bring. Oh well! Just hope the one NOR-ESP translator is available! Has anyone else had to bring a translation of the passport?
As for copies, I didn't make them, after reading this thread. I happened to have one copy of the title page of the passport, the clerk took that but basically she scanned everything herself. She was very accommodating and the whole process took 3 hours and 15 minutes. Most of this was the wait in Edificio 6, which was not bad because there were plenty of seats and nice AC.