Oh man, those are a headache to read lol.
Can you tell me what you want each one to do? I'll work on them by hand. 
The main one is to be able to have an admin write a note and leave the note in a container. Another player can open container and pick up the note and be able to read it and save it to read again later. Or discard it like any other item. Main use is for treasure hunting. Maybe use the "map" animation to open the note when pressing "Alt+N" or something like that. OR be able to leave a .PNG, .JPG or any other picture format file in a container and be able to view it Like a treasure map. OR when someone picks up a note, the note writing automatically goes into the Journal notes section.
Second one would be an area sound box. Much like the old "Jukebox" plugin, when a player enters a area pre determined by admin, a sound file fades in and when the player leaves the area, the sound fades out. This is not meant for copyright songs or such, but just like "creepy sounds" or "distant screaming", etc.
Third one is more extensive. NPC interaction. I would like to have NPC's able to Talk to you and buy and sell stuff or offer "quests". If no talking is aloud, maybe when the crosshairs hit the NPC, an option to interact will pop up (like a green explanation mark over their heads) and you can then use your action key to read a text box of what he/she is asking or telling you. OR maybe combine the sound box plugin to encase the NPC to say things when the cross hairs hit them. I could record a voice saying "Hey, you looking for some work?" or "howdy stranger! I have some items you may be interested in!" etc. I know there are a few economy plugins but most were used in the Java version. Basically a "Quest" plugin for admis to write to get the players to explore the areas and face dangers and get rewards with the option to buy and sell things. Attached is just some ideas.

