2020 single rail mount adapter for Pablo's RepRapDiscount LCD case

I'm building my own version of Tech2C's Hypercube with various changes. Here I've adopted a mount adapter for single 2020 rail and for screws that I have (3x M5x10 screws with a big head, 1x M5 nut and 2x of those weird nuts for t-slot). Also changed hole diameters for M3 screws with a big head...