Since each part sweeps out 90 degrees, larger or smaller models can be plugged together. New docking assemblies can be developed, like shown in the first post of this topic.

Here's a picture of the pluggy hole:

Yes, I found out the same while working on my Summoning Core !  

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Legion 4 "Cry Havoc, and let slip the Dogs of War !" ... "People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf."