Hy m8 
Here i got a little tut for your, just follow the steps. That helps me to add additional engrams to mod structures
- Subscribe and load the StructuresPlus Mod
- Go to your DevKit Mod folder via your Explorer and add a new fodler and name it “StructuresPlusMod”
- Go to the Mod Folder from structures plus in your regular ARK Mod Folder
ID is: “731604991” - now you have to create new Folders in your DevKit for all Storeage Boxes from the mod in your DevKit from the Root like this:
Search your SP_Mod Fodler and copy the names it to your DevKit BP’s (Rename)
- …\Crafting\Smithy\BP_SmithyPlus.uasset
- …\Crafting\Fabricator\BP_FabricatorPlus.uasset
- …\Crafting\MortarPestle\BP_MortarPestlePlus.uasset
To get a BP in your Folder to rename, just use any BP you want. Its just to get the Path to the ModBP
Do that for all Inventroys you need and now just make a new “Additional Structure Engrams” entry for all structures you want to add your engrams in your “PrimalGameData_” just like you did for the regular one
hope that helps…
happy moding