I used 3/32nd steel rod from Lowe's. I measured and spaced the rods about 4 inches apart. I drilled a hole into the mdf the same size and tapped the rods in with a small hammer.
Then I spray painted some plastic door screen I get at Lowe's silver. Finally, I used craft wire to loop through and secure the screen and the bottom edge that cannot be seen is sealed with a bead of hot glue.


Looks ok to me. It will also help keep cars from falling out into "The Dead Zone" where it can be hard to reach :)