Thanks "rob89" for your response but NO, everything is not available for editing. We can't modify the factories yet and the AOGs can only get edited via the screen, no .csv file availability. Joel Billings answered before, looking for an update from him or the development team.
Yes, you can modify factories, via screen : add, remove, change model of AFV / AC, and change the values for every type of the other resources.
It's boring and time consuming but it works. I've done for my scenario.
There are other parameters that now we can modify only via screen (AOGs, national values, VPs etc), but it works, obviously only for ONE scenario ... and with the back-up of original files for all others.