I beveled the edges so it fits tight in a pack-out crate. I wont stay there, but it fits.
The outer holes are for your screwdriver to fit thru, use some 1" wood screws.
2 on one side and 1 on the other.
This works even if you don't have a PO crate!
I made mine with 3/4 pre-finished birch I had laying around.
I included a .stl file for 1/2" plywood also.
Kick back, cause its a 2 day print! It was worth it for me....
Enjoy!