I’m partially in the process of doing this (Partially because I ran into an error and reloaded the entire system to try and fix it). I’ve decided to take the “gui_inventory_slot” and format it to look like the “gui_selection”, but with the details I want. Then, in the “gui_inventory” I’ve altered the “Inventory Slot Box” to have a center horizontal alignment instead of Fill, and that pretty much does it. I’m sure there may be a better way, but that was just how I discovered how to do it from playing around (call it an accident).