Hi, everyone. I'm from China and Dawn of RFC is one of my favorite CIV4 mod... Thank you for your endeavors in bringing a more enjoyable and historically accurate Chinese civ, and I hope my suggestions about Chinese civ as follows would be helpful
UB
Personally I appreciate the ideas that the Chinese UB should be linked with scholar-bucreurcy society and the unique imperial examination system. However, as pointed out before, examination hall" is somewhat odd for a historical Chinese UB. In fact, the places where the imperial examination were taken were kennel-like small houses

.
also
http://upload.wikimedia.org/wikiped...am_cells-large.jpg/800px-Exam_cells-large.jpg
The reason is that the quantity of applicants were always too large, and cheating on the examination was easier to be monitored in this shape. The final step of the imperial examination (the palace examination) indeed carried out orally in a big hall, but that was the main hall of the imperial palace (and btw the examiner nominally was the emperor himself). So that the so called examination hall didnt ever have existed actually.
My suggestion for the Chinese UB is
"Confucian Academies" or
"Imperial Academy".
The
"Confucian Academies", so called "Shuyuan", were private schools where the children came from ordinary families could receive basic Confucius-centered education and finally became able to join the imperial examination. Also the teachers there could concentrate in studies and research without interference.
http://en.wikipedia.org/wiki/Academies_(Shuyuan)
The
"Imperial Academy", so called "Taixue", was ancient Chinese national schools where elected students assembled and engaged in studying classic Chinese philosophies such as Confucianism and Taoism as well as Chinese literature.
http://en.wikipedia.org/wiki/Taixue
The problem is that, the Confucius Academies originated around AD725, so it should replace university rather than library in the game. The Imperial Academy, although existed much long ago (3CE), did not too much for the imperial examination system. Imperial examination system didn't exist until AD605.
I remember in the former visions the Chinese UB was Confucian Academy which replace university(but a little weaker than normal university) and unlocked by paper technology. I think that was a wonderful idea. Why should it be removed. An much earlier university could help a lot for the race for Music and the four great inventions. (paper can be researched by great scientist much early and there is no doubt that the chinese civ would go straightly for it) . Maybe the return of Confucius as the eight religion was the main reason, but anyway it can be simply renamed as "Academies of Classical Learning" or "Classic Academy" or even "Shuyuan"
UP
Since the paper technology is placed in the middle in the tech tree (although it is said the earliest archaeological fragments of paper derive from the 2nd century BC in China), the paper technology based UB cannot help early Chinese civ. I agree to make the UP to guarantee the early research rate. However, the buff of terrains could strongly enhanced China already and why not links the UP to the scholar-bucreurcy society as mentioned before? Anyway it is up to you and besides, both UP and UB concentrating in the middle age would be boring since Chinese civ can start in BC3000 and there should be something unique for the BC3000 start. That's really a long game.
For the name of the UP, I appreciated Leoreth for describing the Chinese civ as the Cradle of Civilization or something like that, but even Chinese ourselves seldom say that.

As a result of the far distance, the Europeans didn't know too much about the Chinese civilization until the Enlighten period IMO. Also the ancient Chinese civ were relatively "late" than Mesopotamian civs and other civs in much aspect. The technologies of bronze working, iron making, horseback ride were all said to be from west and middle Asia in history. In spite of that the Chinese caught up quickly and became even ahead during the Tang and Song dynasties. Maybe the UP should be changed to "Techs that already discovered yet cost -25% research"

. For the Chinese fell behind after the middle age somewhat should partly be to blamed that the ancient Chinese became too proud of themselves and unwilling to learn from outer world anymore until Opium War.

Anyway this UP doesn't mean that the Chinese civ in game should and could go ahead in every tech, which I agree with Leoreth.
I have no idea of the name for the current UP yet, but if the UP were "specialist produce more research" as suggested, I think "the power of the Four Occupations" would be the choice. The "four divisions model society" has rooted in China and other East Asia countries for two thousand years. In such society, scholar-bucreurcy class was highly valued and unlike caste systems, anyone could finally join the top scholar-bucreurcy class by hard study and success in the open imperial examination. Since the scholar class were highly appreciated and mixed with the bucreurcy class, scholars could freely devoted in study. That may present the bonus GP economy in the game well.
http://en.wikipedia.org/wiki/Four_occupations_(East_Asia)
UHV
The four great invention UHV is interesting and historical accurate, as discussed in Chinese civ forums many times. The cathedral UHV may be one of the most complicated UHV object in RFC, which would make a RFC newbie confused(often Chinese

. It tests the overall game skill of the players and could be rather challenging, which fits a long time civ such as the Chinese civ well, so I think it OK. But what does the 120 army UHV mean? In game it is not interesting and will mess the economy up. In the original RFC vision, we can build 120 warriors and win a historical victory at once. But in Dawn, I have to delete all of them one by one because there is another UHV object left... In history it is neither accurate. In ancient China there seldom existed a large army that beyond self-protection expect during civil wars... The third object in original RFC often is functional, indeed. It presents the "dream" of that civ ever had or could had. Bu in my opinion the ancient Chinese never dreamed of conquering the Asia or the world (in the game, 120 units really could get it). They usually content with their fertile homeland... So the former UHV of four golden ages until certain age or something else would be definitely better.
Terrain
As far as I know, the maps of Europe (especially England) and Japan in RFC have been enlarged and the inner land part of China has been shrunk for the reason of gameplay balance. In Dawn, as result of other tweak, Chinese civ had become even weaker. So the terrain around Xi'an has been buffed and more food resources have been added in recent visions. In my option, the inner land part of China are too weak and inaccurate. I don't mean the north-west part and Silk Road cities; in fact it is too dry there and cannot support too much population even now. By the way, the Xian (Chang'an) areas actually cannot always support such an enormous population as many people think. Xi'an did used to very fertile in and before Han dynasty, but after then for the reason of insane chop and whips as well as war, the environment was badly destroyed. In Tang dynasty it did hold more than 1 million populate, but many of them were feed by the great canal. Because the canal was destroyed in the civil war and the food cannot be transported to Xi'an easily anymore, the following Song dynasty had to move the capital to Kaifeng.
However the southwest part is the problem. The Sichuan area (including Chongqing) (in the game it is represented as the city of Chengdu or Chongqing) in the southwest have always been one of the most popular area of China. Now it holds a population of more than 100 million. Maybe it should be buffed?
Historical Capital
The Chinese civ started in Beijing in 3000BC was absolutely wrong, indeed. The yellow river bank area was the cradle of ancient Chinese kingdoms. I think either of Luoyang, Anyang, Kaifeng and Changan (Xi'an) could be OK. The capital always kept in moving and the city names frequently got changed in ancient China, so It doesn't matter too much whatever cities be called and wherever capital be placed in the game, in my opinion. As a macro simulation game, I don't think it is necessary to be perfectly accurate in every issue. That means insane work of coding. However the capital in AD600 should be Xi'an, according to historical archives.
After rescanned from Mongolian occupation, the Ming dynasty did set capital in Nanjing. However, 50 years later, they moved capital to Beijing in order to enhance the defense against Mongolians. Maybe firstly set capital in Nanjing when ripsaws and then automatically move capital to Beijing after recapturing it could be more historical accurate. And after then, Beijing have always been the capital of China, except for a relatively short period that the Nationalists moved capital to Nanjing for twenty years and escaped to Chongqing for several years during WWII.
City Placement
As mentioned before, the inner land part of China has been shrunk. As a result, some of the city placement became rather odd, in my opinion. i.e. the city of Luoyang should always be near the Yellow river and far away from the Yangtze River, but it can also be built just 1N of the Yangtze River....However, that is not a serious problem...
Thank you for reading such a long post... I hope my suggestions would be of use. And please forgive my poor English

btw. I am studying in Japan (now on summer vacation so stayed in China). If it is needed, I am very glad to inquire and make some suggestions about the Japanese civ as well.