Modding Help Is there a mod that only gives you a bigger hotbar?

Close but it doesn't have to draw those boxes. This defines a grid.

Code:

        "mainItemGrid" : {
          "type" : "itemgrid",
          "position" : [5, 27],
          "dimensions" : [15, 8],
          "spacing" : [20, 20],
          "backingImage" : "/interface/bk3k_inventory/empty.png"
        },

"position" dictates where the bottom left position of the grid. 5 to the right, 27 up from the bottom left of the UI. IIRC that considers the footer height too.
"dimensions" dictates a grid - in this case 15 long, 8 tall.
"spacing" is the amount of pixels separating the bottom left corner of each item space. Vanilla spacing is [19, 19]
"backingImage" tells it to draw "/interface/bk3k_inventory/empty.png" behind every spot, but in front of the background image. You could substitute your own image if desired.

That's the image it is using BTW. It just layers the image on top of the background - once for every grid item. And it spaces this [20, 20] apart from one another.

 

That's.... a strange way of doing it, but good to know! Saves me a bit of digging around in the JSONs, lol. I would have never guessed that it started counting from the bottom left; you telling me that probably saved me a bit of time and confusion lol.