The problem is that ore should have an item tag for "reagent" and it doesn't. They'll have the same problem even with a vanilla inventory because the crafting materials really should have that tag. edit: And that's technically a vanilla item(vanilla assets), but not in the vanilla game anymore. I guess the devs don't care to fix thing they aren't using. I could patch it, but it isn't a terribly high priority thing. Guess I can do that with the next version. Anyhow it isn't so much a problem with this mod itself. Not sure what I can say besides look at my mod to see what I did. You may also want to look at a good number of vanilla interfaces to really get a feel for them. It is all JSON for this (because you can't script it). For programs making this just Notepad++ and Paint.net The graphics are pretty simple. You have lots of elements though - it isn't just a single picture but several things put together. You'll see that when looking at the interface. As for making the tools go into a particular tab, that should be pretty obvious once you look at my player.config.patch. "tools" is a category. The whole thing is a system of whitelists and blacklists. You can use category, type, and/or item tag based lists.