This is a datapack that adds advancements, and some recipes such as "SSS (S = slab) to planks .
                                SSS"
(I have not done the rest of the slabs yet).
Some advancements give you items with custom model data, if you want to get the custom textures put the resourcepack in the resourcepack folder. (both the datapack and resourcepack are in the zip file).

Please tell me about any bugs, or suggestions, thanks!