BEST Reprapdiscount full graphic smart controller for 3030 extrusion

I wanted rock solid mount for my RepRapDiscount Full Graphic Smart Controller (Aliexpress this one) so i was searching and found some pretty neat designs, but none was good enough! i wanted it to be bolted with M5 bolts to T-nut screws on 3030 extrusion (Hypercube Evolution, thanks to Scott), but on the other hand, i didn't wanted any screw to be "visible" and thats how i designed this! its NOT TESTED YET, but will be in the next few days, there are pictures of it how it should looks like with t