Yes and no

. The ideas are good
but some don't quite fit. Also unless it has changed I hate the religious festival icon.
I need to get the Natural Wonders in first, then I will go through the list and see which ones fit or not and why not.
Edit For example one of the Great General missions is "Art of War". In C2C we have a wonder "Sun Tzu's Art of War". Does this mean we should replace the wonder with the action? Should we let the GG build the wonder? What about later books on war Clausewitz for example? Or should we have all? Personally I would allow the GG to build more of the war related wonders (Sun Tzu's Art of War, Archimedie's Workshop, Triumph Column and more) and have the war books as well. I need to look at the code to see how this is implemented, since we use buildings very where I would have the "Art of War" action give a free building to all cities which gives the +2exp.
What about Machiavelli's "The Prince"? Would fit nice in the Early Renaissance. With Sun Tzus Book at Ancient, Machiavelli in early Renaissance and Clausewitz in early Industrial we could have a nice continuity. I think those wonders should be able to be rushed by Great Generals or Great Statesmen.
@DH
We could have a little "Book Mod", that contains important books of each of the GP branches in each of the eras and which can be "built" by GP when certain prerequesites are met.
Something like:
Great Lawyer Book in Ancient: Hammurabis Code of Law for example (idk, is it a religion specific wonder atm?)
or
Great Scientists Book in Ancient Archimedes
On the Sphere and Cylinder
(I realize there are Archimedes Engeneering Great Wonders [like the Mirrors of Syracuse or his famous Screw] but some Great Persons had a theoretical as well as a practical impact, especially in the age when polymaths were much more powerful than today as at least an average bit of education is far more common by now.
Also I think that maybe only the "publishing" of a book by a great person could lead to Follow-Up-Wonders. Especially in ancient times but also during the renaissance as well as -of course!- also today this makes sense as Great Persons, mostly Inventors and Artists,Musicians and Strategists or skilled Warlords were invited by many
different Kings or influental people to work for them . Think of da Vinci or Columbus...writing/inventing something at one place/court, building or exploring it for the other.
Or the special/Scripture/Book of a GP branch could always be kind of a "Manhattan Project Approach" for each Era. As long as it hasn't been published certain Wonders that depend on it can't be built... I don't want to make it too restrictive so maybe it could be an incentive to spend a GP to write a GP Branch Era specific Scripture/Book:
What about this: when you, for example wrote that Ancient Era Science Book you receive a production bonus to science wonders and science techs of that n Ancient Era or even more specific boni.
Also, you could spend a GP on a Book but only if it fits your strategy (like: Culture Book yes Military Book no)
We could also make it so that every nation could build that Book of that Era with its GPs - so the books would something like national wonder books (there should be more than enough books to be picked of the different Eras) and also an Great Wonder Book that all civs compete about (slightly better effects than the national era book).
You could only build one though, National or Great Book of the branch/era.
Maybe you could per Era only build one Book of one Branch. This way it could especially with developing traits allow to even more specialize on certain traits or to catch up with the neglected parts of the game (for example specialized in science trait but
building writing a military book to get at least some defense
I could try to make a excel sheet of books for the different branches/eras if you guys like the idea.
Special buttons should not be needed at first I think just the button in GP UI that says "settle in city" could be duplicated and then modified to "write influential book", right?