The upper and lower cover plate is fixed with plastic screws. These then act as a housing feet!
There are 3 narrow walls with: one without holes, one with holes for USB and power and one with three prepared quardatischen breakthroughs.
The case certainly looks truly luxurious.
Oh yes, here is a warning: If you have never worked plastic sheets or even Plexiglas should contact in case of need to someone with experience and suitable tools!