Adding to the first comment:
Items: Place any Material, Image or mesh files into; FeralHeart\Media\Items. Then go back to the previous folder and find an 'Items.cfg' file then open it using notepad. After that go to your main FeralHeart folder and open the items.cfg that's in there. In the previous items.cfg you opened you will find all the new items listed. Copy everything that is in there and paste it into the items.cfg that you opened from the main FeralHeart folder. Finally, click save~
I'm sure there is a tutorial ready made in the claw models so I'll let yew take it from there~