America: With four unique components, I would like most or all civs to get something for the early game. That would require some anachronism for some of them, but I think it's worth sacrificing some realism for gameplay. But you're right, the Trailblazer as I proposed it is still broken. Maybe it can be a settler with slightly reduced cost and ability to defend, like adan_eslavo suggested? Or we could just go for the Monitor idea; I'd be down for America getting an Industrial UU.
The American UA has its largest impact at the "discovery phase" of the early game, so I almost feel like they already HAVE a unique component for early game. If you were to replace the normal settler, or any other civilian unit, then you would have to give up the homestead, not the military UU. That's yet another misgiving I have about this unique settling idea for Uncle Sam. American culture is overtly militaristic, so it seems bizarre to sacrifice representation of their military history to give them either a third civilian/infrastructure UC or a Frankenstein civilian/military unit. I would expect this argument to crop up for a civ with a dearth of military options, but that's not the US:
unique carrier - Nimitz Class (resources already exist)
unique ironclad - Monitor (resources already exist)
unique great war infantry - Doughboy (resources already
partially exist)
unique field gun - Parrott rifle (resources already exist)
unique infantry - G.I. (resources already exist, and actually the combined arms unique promotion they get sounds really cool)
unique cavalry - Rough Rider (resources already exist)
unique battleship - Connecticut Class (resources already exist)
So yeah, the idea of making a quasi- or fully-civilian unit from scratch, undermining this project's design philosophy from the word "go", and doing it for the
US, a civ that gives you the absolute pick of the litter for alternatives, is strange.
Arabia: I could go with the Hashemite Raider. It's in the same line as Arabia's existing UU, but since it comes three eras later, it should be fine. Late modern is kinda late for a UU; maybe it can be a Cavalry replacement instead? Or at least moved up one tech level?
I considered cavalry, but it's a little early for the period. Cavalry in civ V is sort of Crimean War, Austro-Prussian War, etc.. It's anachronistic, but only by 60-70 years, since the Arab revolt kicked off in 1915. The timelinf for the Arab revolt puts it firmly within 1 year of the introduction of landships, and makes it a contemporary of light tanks like the Whippet. I considered moving the UU up to Combustion in my proposal, but that puts it only 1 tech behind the cavalry. It's a weird spot, Cavalry is replaced incredibly quickly in CBP, so do you make a UU with a short shelf-life, or do you move light tank up and make cavalry's shelf life even shorter than it already is?
Regardless, I'm not really worried about Arabia having a late era UU, consider that Germany's only UU currently comes a full era after this. Arabia's UCs are already so front-loaded on the tech tree, it's pretty much carte-blanche for when a late-era UC comes.
1 ancient UB
1 medieval UB
1 medieval UU
Assyria: I think the chariot would still make sense as a Skirmisher replacement. I like the idea of the Lamassu gate, though I'll want to play around with it and find something fitting for it. Yield Faith when an enemy unit is killed in the city, maybe?
Are you still planning on having the iron chariot be a ranged unit?
I'm a bit opposed to the idea of it being a ranged unit, but just a little. My own cursory reading of Assyrian tactics indicates chariots were part of the military core, not scouts or skirmishers.
Alternatively, you could go for the hail-Mary and make it a war-elephant replacement that doesn't require ivory.
I tried to steer clear of faith in my own proposal because Assyria has no existing bonuses to the religion game. They already have 4 competencies: culture, science, great works and military XP. Adding faith makes them too unfocused.
Aztecs: I'd prefer to keep the Huey Teocalli as a Grand Temple, since 1) that's what it is, and 2) the Aztecs need something past classical era. I'll keep your suggestions for its effects in mind though.
I noticed you changed it to grand temple replacement in your own proposal. I think it's a good fit because the base grand temple already triggers a golden age (synergy), and it spreads the UB and UW further apart. I was preoccupied with the fact that the existing proposals for Babylon and Ethiopia both have unique grand temples as well. assuming the Campus Martius idea is abandoned (God willing, the latifundia is a better idea imo), there is no unique replacement for the Heroic epic in the game . I was trying to spread the UC love and got tunnel-vision.
Perhaps Babylon's Entemananki could be moved to be a national monument replacement? That would actually fit their GP focus better, since they have no prior faith synergies.
Re: the workers building on coastline. I havent tried the base mod with VP, but that is how the Malaysian civ currently deploys kampungs in the existing mod. Assuming everything works as intended adding the UI should require minimal effort on my part. It's the UU that worries me