I have a 489 subsequent visa application for my wife lodged for 2 months now. Yesterday, we got a case officer assigned and we were requested evidences of our relationship.

As we were separated for last couple of months we have a lot of chat history, phone calls, emails, etc...

Skype chat history need to be translated in English?
We have about 30,000 lines. With all this we have a lot of "call duration 1h30min"

About "statutory declaration". Any suggestions?

a place where we've met
details about the fact that we lived separately because we both had individual rented apartments within walking distance
things we have in common, where we complement each other
how our relationship evolved and how our decision to get married
our future plans together.

Someone else in a similar situation?
Someone else which finalized all this process?