Just print one of each. Fits this screen: https://www.amazon.se/dp/B0D1C4XLNY?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 with a raspberry pi 4 mounted to the back. 

You need four m2.5x25 screws to mount the screen to the bracket.

Stack the screen, testfit and wall mount bracket and screw in the screws from the back of the wall mount. Then mount it to the wall with the provided holes in the wall mount bracket.

Press fit the outer shell onto the screen and then you are done!

There is room for cables out the top and right side (can easily be removed in freecad).

Freecad file for customising provided.