Then this is an good alternative to using the normal cardboard boxes.
Its designed to make good use of the material and to be long lasting.
800* 400* 6mm MDF or whatever you want (whats MDF in english?)
Step 1: Cutting
The first cut should be on the long side, so then you only need to cut pieces off of the two resulting boards.
Step 2: Key and Slot Joint
Depth and width of the slot and key joints are 3mm unless otherwise noted!
key on all sides
key only on opposite side of the hole
key on the long sides
slot on the back side, 2mm from the border
only Part 3:
slot on the front, 6mm from the border, 6mm wide
slot on both the front short sides, 6mm from the border, 6mm wide
slot on both the back sides, 2mm from the border, 3mm wide
slot on all long sides, 3mm from the border
slot on the long side, 3mm from the border, 3mm wide
Step 3: Cutting the Apple and the Tap Hole
Drill half a hole into part 6 and 7 with a 35mm drill.
Step 4: Glue
Of course you're not glueing part 7 and 8 to the others...
Use bar clamps to hold the parts together tightly. It'll take about half an hour to dry.