I think this is a clever thought experiment. For those of us who think there is a genuine hard problem of consciousness, it won't convince us that physicalism has anything close to an explanation, and I'll try to explain why.
When you dismantle a brain, or indeed a body, you lose something else as well -- you lose the capability of any kind of consciousness to (a) report back on its experiences (no mouth or no neurons to fire), and (b) store memories of those experiences so that when it's rebuilt it can report them back. So depending on the story we tell, there are other accounts of consciousness that are not ruled out by this experiment, such as panpsychism -- e.g., perhaps there's consciousness even in the atomic things of the world, in which case organisation isn't the relevant factor.
Moreover, suppose the organisation is important in the way this thought experiment suggests. What is the explanation for why some kinds of organisation produce consciousness, while other kinds of organisation do not? Say, the sand on the beach vs the component parts of my brain? I suspect the response will be related to the amount of information or entropy present in one vs the other, which is a measurable physical property. But then we wonder, *how* does information or order or whatever other physical property we point to produce consciousness? These all look like correlations -- try and find a pattern and say "this physical thing (organisation, information, order, firings of neurons, etc) is the thing which has consciousness". Maybe it does have consciousness, but *why*? Even if you show us that organisations of physical things in the right way is the place where we always and only find conscousness, why do we always and only find it there? These things are clearly not identical to consciousness/phenomenology/mental stuff (organisation is not consciousness), so why do we impute consciousness onto them?
We impute consciousness onto them because we have that first hand knowledge that we have an inner life, that there is a what-it-is-like to be us, so we have to locate that somewhere. It can't be eliminated (though some thing it can!), and so we have to find room for it. And if you are a physicalist, then you know, per your theory, that the answer must be found in the physical world somewhere. Therefore, in your clever thought experiment, you find your way to track down organisation as the relevant physical property. But then the question remains, how and why does organisation come to be/produce/create consciousness?