Many thanks for this @StrawmanAndy sent me these exact instructions before Christmas and I managed to get them working on the Cortina. Now, I don't know if I was doing this wrong or not but from a modders point of view, each json file has to be paired up to each individual skin. So I had to open each json file and insert the skin name and also the skin_Region name in the relevant section. I don't know if there's a quicker way of doing this. I had 70 skins to do, so it was quite time consuming. Although not as bad as the 350 icons I had to do!