So, here were go.
First of all, you can play the demo game here : Epic Static Dungeon | Play on gd.games
It shows off many possibilities of the extension.
And i fully commented my code here : slot_inventory_game.zip - Google Drive
If you have any questions, feel free to ask.
And just in case : note that this extension is only for data management and won’t display anything. Other extensions exist for having grid views and so on.