Brick Block Puzzle Box remix

The changes compared to the Original:

1. Removed the cog window on the Level 3 Cover to prevent small contents jamming the mechanism
2. Added Level 3 cover variant that uses a ISO 7091-3-100 HV washer to make the screw head look a little less lost
3. Reduced the cutouts for the locking mechanism on Level 4 to 2 to prevent locking it in the wrong orientation
4. Made the positioning aid for the centre end brick round so that you can adjust the alignment if it ends up crooked
5. Reduced screw hole measurements from 3mm to 2,75mm to prevent screws free spinning
6. Added option for having a lip on Level 4 so that it won't look different when locked