Stopped by Bunnings on the way home tonight and picked up a bunch of miscellaneous venting hardware
Take the aluminum fly screen, cut it and fit to the back of each of the 5 louvre vents.
Fit two of those louvre vents to the top of the left hand side of the box
Fit the other two in the middle on the right hand side of the box
Fit the last one to the bottom of the door.
Place fly screen between the other vents, and place them in the floor of the meter box.
That should about fix my airflow I hope :D