Help with the Z-Axis and the its depth

Well i was thinking in adding to my top-down game a system with plataform which use the z-axis, where i can walk below it, and also be able to do other things like:
- create instance in the same z position.
- be able to put specific tiles on it.
- use a depth manager to organize the positions.
- create like a stairway to climb to reach the desired z position.

i've already searched many videos like
and tried inplementing the FriendlyCosmonaut depth system into this but it doesn't work so much.
here is my test project : https://www.dropbox.com/s/2493q4fqjztxmpd/Z Axis Test.yyz?dl=0


i appreciate if someone could help me understand more about Z axis and its uses.
 
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