@happy3690, you have good intuition in trying to relate the memory systems to data structures because they are a good match. My background is in teaching computer languages and analysis. I see any narrative as a variable-length unordered doubly-linked list of visual memory records I call visual sentences. The common field tells you what kind of system it is. It’s variable length because fields are shared and added as necessary.
And I see the peg system as a fixed-length ordered key-value (map, dictionary) collection of visual sentences tied to an index of an ordered set of memory images. The fixed length is because I leave room for eight fields in a memory image, the subject, any enhancement to the other four, the action, the item, and the terrain (SEA-IT).
Check out my systems analysis topic if you’d like more information.