Install the spacers
Push in the female-to-female spacers into the holes of the cases - the 6 of them.
On the right side, remove the top right screw and replace it with the male-to-female spacer (in yellow).
The kit has short and long M3 screws.
On the left side, screw in a female-to-female spacer from the top with a short M3 screw.
Install the case
Screw in the spacers from the top using the short M3 screws, just like on the normal cases.
Install the plate
Peel the plastic on both sides.
From the other side, screw in the acrylic plate using the long M3 screws. Install them on the side with the chamfers.
Install the anti-slip pads.