I found a solution. In the data.lua you need to change some arguments.
line 13 is changed to linkedChest.picture.layers[1].height = 128
line 14 is changed to linkedChest.picture.layers[1].width = 128
and line 15 a change the scale value to 0.3 to fit inside a tile.
Here is the pastebin link if you need: https://pastebin.com/CRptxife
In the pastebin one added circuit network capabillity.
Hope I helped.
