I watched a couple other vids about that and turns out he not only used steel plate but a layer of cement between the 2 layers of steel. Kind of ironic that he used cement and it all stemmed from a beef with a cement co. I wonder if he bought the cement from the company he had the beef with.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!