The above image shows how I decided the length of the inclined plane for the piece. This was decided before placing it in the cigar box.
The image above shows the plane and cigar box inside the larger wine box. At this point, I had decided to use the glass (purely by the accident of placing it in the box to simply support the cigar box). The cigar box does not touch the wine box but is suspended slightly above it to create a tension, being not obvious. The same applies to how the incline extends beyond the edge of the cigar box.