The problem is, well before tackling the human brain - with functional units, wiring, evolutionary rewiring¹, modules, multiform glias and mysteries in general etc. - that of transparency, i.e. already in the C. Elegans you can see complex behaviour in the studied system, but the hard part, that of understanding why and how that structure presents that behaviour, is unachieved. It is still a "black box" like some ANNs. We know the structure of the C. Elegans since 1985, but we still do not know well "why it works, why it works that way": the "scientific problem" of understanding the "natural phenomenon" we found, in order to export that understanding, is still pending.
So: we have simple brains described, they are simulated, and to just look at them will not make you much wiser until you really manage to "crack the code". There is not really an «Hello World» yet. It does not mean your doctoral efforts could not achieve it though!
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¹ Evolutionary rewiring: the human nervous system is also made by "afterthought" increases which overlapped on pre-existing structures "patching" them, instead of "correcting, reprogramming" them - so one will find a system that may show to be a masterpiece of cleverness but not a masterpiece of planning. In other words, the human brain is something relatively messy, not a clean blueprint.