The Pentultimate mechanism is made of of 20 triangular and 12 pentagonal shard-like pieces. Every piece has 12 built in female grooves at 12 different vertical levels.

The grooves line up when the pentagonal pieces and the triangular pieces are placed together as shown.

Each pentagon owns one level of the track, and has male tabs protruding from one single distinct level. The tabs fit in the grooves of all the other parts.

Since each pentagon has male tabs at a distinct level, any pentagon can pass by any other pentagon, and the male tabs won't collide, being at different levels.

The male tabs (of 12 sizes) are modeled separately, and are designed to fit at their one distanct level perfectly. Shown here is the model for one of the tab levels.