I dunno, that looks pretty well built. I like the hardware. I was looking for corner protectors similar to those that but I couldn't find them in the finish that I wanted.It's a thing of beauty ~ Good Job !
As a kid in the early 60s we built and raced our own slot cars. A fellow would take us from one event to the next and we needed a box for all our cars, controllers and spare parts.
I bought a tackle box similar in design to what you have made ~ however, the build quality on our units pale in comparison to yours. Seeing your creation brought back a lot of memories.