My friend introduced me to these frames and I instantly wanted to make a shadow box for my daughter’s room. So here is how I did it.
First, I ordered a 20″x30″ frame from here.
Then I removed the back, measured the open area and how tall and wide my box should be. I went to Home Depot and had them cut 4″x1″ boards the lengths that I needed them. I made sure to measure the the top boards so they would create a nice corner with the side boards – they actually extended 2″ longer than the opening (1 inch on each side).
I also had them cut a smooth, thin, sheet to fit the back of the frame. (Double check your measurements).