1.Layer one fits in the bottom of the case. it is 30mm (1 1/8") thick (1 total piece)
2. Add layer two - 57mm (2 1/4") thick (2 total pieces)
3. Layers 1, 2, and 3 will fill the case up to the tray. That is the first 30mm layer plus 2 57mm layers.
4.All 5 layers will fill the case to the top.
Confused by the order in which they go in the box?
Check out this picture: