They've addresses "build parties" in previous rulings, this extends to more than just pushing a button. By listing CNC, machines, tools and equipment of their dominion they extend it much further. Additionally, they are also limiting any person from ever touching a finished 80% lower other than the owner. It seems like they are disallowing work on updating a LPK, engraving, other modificatios, or coatings by anyone other than the owner/maker of a finished 80% lower.