Raspberry PI 3 Box - Big Passive Cooling

This is a passive cooled (with a costume big 28mm x 28mm x 15mm heat sink) Raspberry PI 3 box with a "Clamp" on the long side. I did not find any box fasten this way and not along the long side. I used (a variation of) this on my "MagicMirror" project: https://photos.app.goo.gl/FUoiEjMmNBIay1Xk1

Note 1: The lid "pushes" on the heat sink (from the top) so it is always pressured down against the small plate, the plate is then pushed against the CPU so the heat transfers better.

Note 2: Remem