Magnetic storage racks for Army Transport case

I wanted to transport my army, but foam doesn't work that great with big monsters and pokey Tzeentch guys. So I designed this for the existing Army Transport bag I had. I printed for the 13" x 13" x 7.5" space I had. But the design is modular. Included are the Fusion 360 files I used. I purchased 20 GA. (.036 thick) Cold Rolled Steel Sheet from MetalsDepot in the US at ~$11 a sheet. Print two copies of the frame piece and glue together, then place the metal sheet in, then glue 4 columns into place.