The red box is an old drill box which has been glued onto the back of the cage with a hot glue gun and the ethernet cable is then glued to this with hot glue.

You can also see the power cable coming through the hole in the back of the unit as it is pushed back by the empeg with no kinks or foul ups.
You can see if you go down this route you need a good bit of room behind the cage and tape up the rod,wire,spoke carefully so it doesn't foul