Ender 5 control panel back cover

This is the cover for the Ender 5 control panel.

The cover is mounted using stock screws.

Soon after I successfully tored off by ocasion some SMD resistor from that panel (luckily I've managed to found the replacement and solder it), I've decided to cover it with something. Because I did not want to go through the whole thing again.
Things I've found here were just a plain boxes. And boxes have the property of their walls being quite flexible when you press on it. So walls should be either far away from the board or be so thick that you can't squeeze it.
So I've decided to design such a cover by myself.

Three main points where at the focus during this cover design:
Cover should be as rigid as possible - when something press on it or kick it or do something else physical to it. So it is designed basically as a set of stiffeners.
Cover should be as low profile as possible (because Ender 5 is slick and I wanted to keep it that way). So I've measured all the control panel