Simulating a brain would mean that reason, the ability to discern good from bad, is a statistical process. All scientific evidence so far shows that this is not the case, since AIs do not have the ability to "understand" what they're doing, their input data has to be classified first to be usable to the machine. Especially the problem of model collapse shows this, when an AI is trained on the output of another AI, trained on the output of another AI, it will eventually produce garbage, why? Because it doesn't "understand" what it's doing, it just matches patterns. The only way to correct it is with hundreds or even thousands of employees that give meaning to the data to guide the model.

Consciousness presumes the ability of making conscious decisions, especially the ability to have introspection and more importantly, free will (otherwise the decision would not be conscious, but robotic regurgitation), to reflect and to judge on the "goodness" or "badness" of decisions, the "morality". Since it is evident that humans do not always do the logical best thing (look around you how many people make garbage decisions), a machine can never function like a human can, it can never have opinions (that aren't pre-trained input), as it makes no distinction between good and bad without external input. A machine has no free will, which is a requirement for consciousness. At best, it can be a good faksimile. It can be useful, yes, but it cannot make conscious decisions.

The created cannot be bigger than the creator in terms of informational content, otherwise you'd create a supernatural "ghost" in the machine. I hope I don't have to explain why I consider creating ghosts unachievable. Even with photo or video AIs, there is no "new" content, just rehashed old content which is a subset of the trained data (why AI-generated photos often have this kind of "smooth" look to them). The only reason the output of AI has any meaning to us is because we give it meaning, not the computer.

So, before wasting millions of compute hours on this project, I'd first try to hire and indebted millennial who will be glad to finally put his philosophy degree to good use.