PC: Da Vinci's inventions developed

How plausible is the idea of Da Vinci's ideas and inventions being put into practice? I'm writing a TL around the time of OTL's Thirty Years War and I foolishly watched the Three Musketeers (2011) and now I want something of Da Vinci's to actually be put into practice.
 
Very little of it would work as written, even if we make modern extrapolations and assumptions. Some of it would be interesting, though. I doubt iot would have much of an impact. Most of his designs were not the inspirations of a solitary genius, but variations on themes that engineers and artists were playing with, but couldn't quite get to work. I've seen sixteenth and seventeenth century toys in museums - multiple-shot field guns with cranked magazines, revolver rifles, multibarrel pistols with rotating barrel arrangements... they all look incredibly cool, and didn't work well or reliably enough to make it into mass production. That will likely be the fate of da Vinci's inventions, too.
 
Personally the most interesting way to start such a timeline would be changing these events and make the two of them succeed:

History is sometimes made by seemingly insignificant moments that turn out to have been pivotal in hindsight--and sometimes what didn't happen proves to be as important as what did. One such moment came in the Florentine court of Cesare Borgia, when a civil servant named Niccolò Machiavelli recruited a local engineer named Leonardo da Vinci to devise a plan to change the course of the Arno River. Diverting that river, Machiavelli reasoned, would deprive Florence's enemy, the nearby city-state of Pisa, of a dependable water supply. It would also make the Arno River navigable for oceangoing vessels from the inland city of Florence, and as an added incentive, would help limit damage caused by the flood-prone Arno to the surrounding farmlands.
Machiavelli and da Vinci devised a hydrological plan for the river that was extraordinarily promising, at least on paper. The flood-prone Arno, however, made the task an impossible challenge. The pair's chances of success were further reduced by poor design, bad timing, and undisciplined workers.

Fortune-River-Machiavellis-Magnificent-Florentine
 

Artaxerxes

Banned
More important than his shiny toys were his Anatomy drawings and methods of dissection, there are things in here we have only just learned for sure within last 100 years.

He was writing a book in partnership with what passed as a doctor at one point, someone who could actually get the poor ADD addled genius to sit down and write this stuff down in a legible fashion but the doctor died of the plague before the book was half done and it was never finished.
 
Dammit, the more I read the more excited I get. He designed mechanical limbs which do actually work. Thats so awesome.
 
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