Clear a large round board (at least 45 cm diameter). Arrange the dark crackers in a full circle around the outer edge, overlapping slightly.
Inside the cracker ring, build a wide ring of orange cheddar cubes, standing them upright and pressing together, about 2 to 3 cubes high.
Lay a ring of chocolate segments or dark crackers flat on top of the cheddar to act as a structural separator layer.
Build the next ring inside and on top: roll each salami slice into a rose and arrange in a tight circle, tucking the edges inward to keep the tower's conical shape.
Add another layer of cheddar cubes, this time in a slightly smaller ring, keeping the sides angled inward.
Top the cheddar with a ring of alternating black and green olives.
Stack the chocolate sandwich cookies in a slightly tilted column above the olives, leaning the stack at a slight angle to mimic the witch hat's curving tip. Press together firmly.
Surround the outer crackers with mini sausages or breadsticks, then scatter pinwheel cookies and cheese fingers in the remaining spaces on the board.
Cover with an inverted large bowl and refrigerate for up to 2 hours.