I'm sorry Tenacity but you are mistaken. The Osiris was developed by Liberty as a next generation battleship, something to replace the aging model that was currently(and still is in use). Yes it was stolen by the Order, but that doesn't mean that the technology used within it is exclusive to the Order.
Seeing as it was developed in Liberty they would have redundant copies of the plans for the Osiris in every secure location possible, at least in my eyes, and if thats true why in their right minds would they stop developing technology in that vein and still and just sick with aging battleships while all the other houses are developing newer stronger technologies?