Structure...

I have drawn up a structure of my multi-linear narrative based on 3 little pigs. This is how it works:

A black square represent a snippet of the story.
The red lines is what link up the black squares therefore they link the story up.
The time line goes from left to right.
The longest straight line of black squares is the main story.
Anything else are events that never happens in the real story.
They give choice to the user/ player to see other circumstances that could happen.
This gives the story a multi-linear structure.
Any black squares above or below the main time line which is the same level vertically takes place before the main story.
All the events that are not real will eventually link back to the main story.