BMPCC viewfinder adapter (for 3" 3:2 DSLR viewfinders)

I noticed that most viewfinder loupes for BMPCC are much more expensive than cheap DSLR viewfinders, so I created this adapter to use a 3" 3:2 DSLR display loupe on the BMPCC. So far tested it works well and the entire screen is viewable.