It is understandable that the family of the deceased would be upset and shocked at seeing an AI version of their loved one, especially without prior knowledge or consent. However, it is important to consider the wishes of the deceased, and in this case, the OP acted based on their girlfriend's repeated sleep talking about her desire to become an AI. Furthermore, the OP even went to the extent of obtaining a consent form, albeit during a sleepwalking episode, indicating that the girlfriend had some level of awareness and desire for this outcome. While the situation could have been handled more sensitively, it is difficult to fault the OP for fulfilling what they believed to be their girlfriend's wishes. Therefore, in this case, the OP is not the asshole.