Cave of Birds - a place of refuge, so perhaps a defensive bonus
Maybe its like one of the vanilla wonders that gives a defensive bonus in all cities?
Tuek's Sietch - trade bonus or bonus connected with offworld goods
I like this. Maybe +3 trade routes in this city, and a +50% foreign trade yield?
We should remove the trade routes from the current Landsraad embassy wonder, and make that really just the UN wonder (and with a huge culture output).
Weather Control Satellite
Interesting... maybe this could do some combination of:
a) block storms from entering your borders (they disappear when they try)
b) increase terraforming rates within your borders
c) decrease terraforming rates outside your borders
Guild Spy Ring - espionage
How about "Guild Intelligence Bureau".
Gives a huge espionage point output in that city.
Propaganda Corps - happiness
+2 happy in all your cities?
Bonus xp to all new produced units (like the pentagon)
And maybe an Imperial War College, which gives bonus xp to new units in just that city, and an increase in great general production rate.
Manual of the Friendly Desert
I don't like the name. How about "Quality stillsuit factory", or "Desert adaptation".
Maybe it could give the desert warfare 1 promotion to all units produced in it?
Relic Emporium - happiness/financial
I'm not sure this makes sense. If you're trying to mimic the very late-era things like people selling fake stillsuits and crysknives and other artifacts, that is a little beyond our timeline, and only really makes sense for Mahdi and Quizarate religions.
Why should this be a wonder? The Ampoliros is just an old story about a flying-dutchmen type spaceship.
Huge defense bonus, and culture bonus, and espionage bonus?
Maybe we could make House Shield Generator a national wonder, which gave the benefits of the force shield, but came at a much earlier tech? So at the very beginning of the game, each faction still has 1 big shield generator left that they can build to defend a particular city?