Looking for help porting a CIT item to custom model

Hello! I'm trying to convert this resource pack - https://www.planetminecraft.com/texture-pack/hextech-mace/ - so that it can be viewed in vanilla on a server I'm running for my friends. I found this tutorial - https://youtu.be/4B1qkYmtaZg - and managed to get the custom item set up and give it to myself in game, however the texture doesn't seem to be loading. The model has the correct shape but still is black and purple. Could someone experienced take a look at my files and help me figure out why is that?