1. "Multinational effort" in the 16th century? That sort of thing is hard to pull off in the 21st. And why would Asian nations spend good money to help the Egyptian build a canal to get to backwards, Mongol-ravaged, doesn't-export-shit Europe?
Multinational in the sense that their was a discussion like 'Hey, we can't really do this ourselves, but if you guys help you'll get a bunch of good shit in return.', though of course the world, or atleast the Asian part, is more advanced technologically and sociopolitically.
They built the canal for themselves, Egypt's only independent to ensure no one nation could try and take over and monopolize.
Europe was'nt ravaged to the point of being unproductive, in actuality it was'nt really the Mongols totally levelled things as much as they did lesser damage to a larger area, as such Europe does actually export some stuff the Asians are interested in (Europe adopted new world crops pretty fast) and they eventually got tired of depending on the Silk Road.
2. Nicaragua canal built in 1710s? The Red Sea-Nile Canal is historically plausible, but I don't see that a Nicaragua canal suitable for ocean-going ships would be much easier than the Panama canal - and that was a seriously tough job even for an industrialized nation such as the turn of the 20th century USA.
By the time Asia was technologically equivalent to roughly 1850-1870 IOTL, and in the end the Nicaragua canal is actually easier than Panama, since you only have to build two smaller canals linking the already existing lake, and it did take 20 years to build.
3. Sure, the Mongols ravaged Europe pretty bad, but the Mongol Empire must have collapsed some 400 years ago at the time of the map - I would expect some more state consolidation by that time (I'll note that the 1770s Middle East OTL did not consist of a bunch of tiny wee states. Sure, feudalism, but kings were _always_ trying to bulk out their domains. At the very least, England would probably be asserting its claims on former France once the Mongols left...)
The HRE and it's hundreds of states does'nt exist anymore, what else do you want?
England does'nt actually claim anything outside of Britain anymore, they just retained close relations with Guine (or whatever it's called), and it's more a situation like Hannover IOTL.
As to the rest of Europe, well this only shows 1770, and with no larger European Empires Europe has for the time hit a point of relative stability..not that it will remain that way, after all those Sudovians do dream big and France has gotten the other French states to integrate some more by playing nice.
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4. The canal being used as a venue for European conquests while the Egyptians are left alone - it seems a bit unlikely, and in any event, the Egyptians aren't going to be letting people through
so they can conquer Muslim territories right next door - heck, if they're going to fuck with the Holy Places of Islam, the Chinese or Indians better go ahead and conquer Egypt before the locals
choke the canal with Asian pagan corpses, that's all I'm going to say.
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As I said, Egypt exists only because Asia lets it exist, I considered showing it as a Condominium, but that would make it look like the Gay Caliphate.
Medina, Mecca and the other Holy sites are still under Muslim control, and the the area is actually a partially willing Protectorate, in general the Chinese just some of the coastal city-ports and leave the alone.