Bombshoo, just so there is no confusion, my only concern for your project regards whether Civ3 would allow for such an interesting scenario. I want you to know that I do applaud you for trying to make this scenario possible. And in fact, I am curious to see whether you will be able to pull it off because the extremely unsusal mod I have been trying to finish has some fundamental problems I think that this scenario will encounter. I guess we'll see.
But I have no desire to be a downer for you. Instead, I offer some general suggestions which I hope you will find useful:
1. Don't make China and Boxer separate civs. Instead, use the "hidden nationality" flag for buildable/improvement-produced boxer units. Now, hear me out, I know that in real life, there was no doubting their nationality. But this is a game. And I believe that this flag will allow for you to best mimic real events. Computer civs hunt HN units; plus, attacking with HN units do not cause war. . .
2. . . . After all, you may not want China to be at war with anyone until the Manchus back the rebellion officially. One way to make this event probable (since Civ3 does not have an events option) is to create a chinese flavor tech tree that bottlenecks at a "tech" called "The Manchu Government Considers Declaring War." The starting Chinese government could be called "The Manchu at Peace." Chinese units in the first goverment would be able to build weaker HN units; but to build stronger units that would incidentally not be HN, the player would have to research the new gov tech. But most importantly, you'd want the first gov type to be considered favorable by foreigners; and the second would be unfavorable.
3. The player playing China should have a chance to win the game; but they should not be able to come close to overwhleming foreign civs. This fact directly impacts the scope of the map. This is because the map should focus on China and its immediate neighbors. But if so where would you put American, Russian, Japanese, and European cities? The nature of Civ3 is such that the Civ that owns the majority of the territory has an incredible advantage in terms of production and income. In other words, if we play on a big map of China, then clearly, China will be able to outproduce the reallife superpowers. This is not desireable. At the same time, even though playing on a global map has its merits because of the neat potential for using the Panama and Suez Canals, it would take away from the fact that the focus of this scenario should be on China. The suggeston I have for now (and I'm sorry to say that it's a bad one) is to allow the owners of each sphere of influence to own many of the cities under their control. For instance, Hong Kong would be a British city with a British population. This would definitely weaken China--and the foreign powers' superior units would make things very difficult for the boxers.
(4. Incidentally, if you could get someone to make a martial arts master unit, you'd find that C3C comes with the perfect sound wav for it: incredulously, the shogun unit sounds more like Bruce Lee's characters than Toshiro Mifune's.

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5. You should allow for Diplomatic, Victory Point, and Elimination victory conditions plus Accelerated Production and Capture the Flag.
5a. The Diplomatic condition should be tied to a Great Wonder called The Boxer Protocol. But you should change the script so that instead of voting for a world leader, the players would vote for the right to draft it, ending the rebellion. The name of this historical protocol is intriguingly ambiguous in that it could have been the name the Boxers could have assigned to any treaty they would have coereced the defeated foreigners to sign.
5b. The foreign powers should have the option to rescue foreign diplomats, Chinese Christians, missionaries, military units; this should be an integral part of the game and the rescuer should be rewarded for their effort. If time runs out, then the effectiveness in rescuing should be a consideration in the ranking. These units would be princess units and should appear in Chinese cities. Chinese political prisoners should begin in foreign cities.
5c. The Chinese should be victorious if they manage to root out foreigners in China and in the map. But the super powers should also have the option of taking out everyone else also.
5d. Always use accelerated production, please.
This is getting to be a long post so I'll stop here. Tell me what you think of all this. And happy modding.
