Custom Items / Item Mods / Items Items Items

Been looking about to see if anybody done anything like a collection of items to add to the game. Could not seem to find anything significant. 

Anybody wants to plug their items mods here? Else, I might be trying to create some custom items to add to the game, but my modding skills are amateurish and hardly could be called skills.

One quick question for more experienced modders. I noticed items in core folder are split into category. Is that required for modded items or can I consolidate weapons/armors/items all in one file?