Is AI Possible?

Even if you can't, a story is allowed to stretch science a little but still keeping within the realms of reality.

All humans are AI, we are human-made after all :^)

If you want to implant a brain in a chassis, what you should really be doing is replacing the body with an interface. Assuming you have neural-chip electronic interface tech, then you could interface with the optic nerve, auditory nerve, spinal cord, etc

Though, since the spinal cord and associated ganglia do some processing too, then maybe you'll want to interface with the nerves coming out of the spine rather than with the base of the neck, though you could just assume that you're able to produce chips that replicate that comparatively simple (certainly much more simple than the brain) processing.

Even if you manage that, and manage the replacement of the skull, spine, etc with artificial parts to maintain and protect everything, then you still have to be really good at making signals that the brain can make sense of -- you don't want the brain performing suboptimally due to continuous nausea or phantom limb feelings, for example. And the person might even get depressed, or have a host of other psychological issues stemming from the transplant. I highly doubt even the most committed transhumanists would be able to transition like that without serious issues. But there are ways around that -- maybe instead of a full transplant, you install an interface that allows a person, with training, to communicate with embedded electronics.

But really, if you're capable of all this then why not just grow a network of nerve cells on a chip and use those for neural network tasks? I think that experimentation with artifically-designed organic brains grown on chips would lead to many more breakthroughs, both medical and in AI research.

> In reality science makes anything possible if we have enough time and brain power dedicated to the question

No, it quite certainly does not. Violations of the second law of thermodynamics, for example.