Thanks! Quantum Apprentice pointed me in the right direction. He recommended I post this info here because he also was having a hard time finding much info on the topic.
I haven't implemented this to my game yet (just did this to show a friend how to do it). My original thought was to add it to the shelf container in the Elder's tent so the player can stumble upon it if they chose to search the Elder's tent. Adding it to the player's inventory upon receiving the Vault suit and Pipboy would make much more since, though.
I like that idea as well!
I just finished making the mod, and it works (I changed a couple of things from the video version, like having the tape added automatically after you get the Pipboy). Now I need to go back and add the full "memoir" text to the tape. I am also trying to figure out if this mod can be made more compatible with other mods by using script hooks rather than editing existing files.