Yes , Greg put the cilindrical example too.
But a good Hex shape, was more feasible to be used.

They said that the Infusion hull is "stepped" on the beam attachments and the rest is symmetrical, thus the symmetry below the waterline wording. Although I didn´t want to limit hulls to symmetric shapes only.

The Hex example was to provide a loopwhole for the hull/daggercase vertical plane.(previous wording)