Unique units thing are pretty good as a model for ships, vehicles, etc.
Its not as good a model for infantry, because infantry aren't really specialised in the same way as navies or aircraft (you build different vehicles for different roles, you don't do that with your infantry, especially not in 1880) until we start getting mechanised infantry, etc. and as a result your general "army doctrine" works better to represent differentiating your military in comparison to other countries.
I guess it comes down to how your military model works. If your model is able to take into account that kind of specification of your army (and, if you've got a model for unique units, i guess it can, but I don't know what you've got), then I think it'd be very cool to have.
Ed: How would you like parties? PMed, in this thread, or in the main one?
Also, a few notes on other things.
A Brief Sort of History of British Foreign Policy
Out of character, because I'm kind of entering the realms of speculation, but still. Here's my sort of vision for what Britain has been doing and how its been developing, in the context of the rest of the world.
In 1815, you've got a Britain which, if not exactly beaten, isn't the global hegemon that it was after the defeat of Napoleon in 1815 OTL. They've had some good successes in New England and North America, with a powerful, friendly New England independent, control of the Ohio, and the conquest of La Plata, but on the other hand the most powerful state in Europe is more or less a British enemy and they don't have any good friends left on the continent either.
As discussed between JK, LoE and I, we came to the conclusion that due to the nature of the Napoleonic Wars, they didn't so much end as peter out. In the end, everybody dropped out of the nth coalition or whatever and the UK was left alone. A bilateral treaty was signed, and this time it held, because the will to stop Bonaparte had faded and he has been more or less accepted into the political system at this point.
The existence of the Grand Duchy of Warsaw suggests that the Russian campaign didn't happen, but we kind of collectively came to the conclusion that the Spanish one did. Spain could be ruled by the Bonapartes. A Bonapartist king in Spain leads to a backlash in the Americas, with most of Spain's empire collapsing with the exception of Cuba. This rebellion would have been propped up by the United Kingdom, eager to see Bonaparte's empire weakened. Similarly, Portugal would have survived the Napoleonic Invasion with the aid of the Duke of Wellington, only losing Angola to the French in the process. Portugal is likely a staunch British ally.
Britain and Mexico
Mexico is missing a few of its parts. As agreed between Immaculate and myself, the conclusion was that California and Texas have been split off by fillibustering freebooters, etc. Texas and California likely see their independence maintained by threats of British intervention should either the US or Mexico attempt to retake them. The Yucatan, by contrast, is likely the result of a local Mayan independence movement.
The question is, why would all these regions secede from Mexico? Most of these secessions failed historically, with the exception of Texas, which had a lot of help. Personally, (and let me know what you think, Immac) I like the idea of Mexico falling into a major civil war between the interests of the Liberals and the interests of the clergy and the Hacienda owners, probably sometime in the late 1830s early 1840s. It's a big war, and it drains both forces fighting over the Mexican core regions badly, to the point that the sparsely populated north just doesn't see remaining part of Mexico as worth it anymore. Texas and California secede, with British and American aid, and the Mayans in the Yucatan begin a long-running independence war against anybody who strays into the region.
Eventually, in the early 1850s, the war peters out with somebody being the winner. Mexico is an Empire, we're given this. The typical "foreign interventionist Hapsburg Emperor of Mexico" is a bit dull to me, but its not exactly my call, but I had the idea of having a home-grown general (from whatever side) taking power in Mexico and crowning himself Emperor. He's a home-grown Napoleon, and he knows it, which puts him more and more in the French camp. Emperor Don Diego de la Vega (name just for the sake of example and honestly, just coz its funny) reigns over a reduced Empire, but he brings back a measure of stability. At some point, Diego I dies and somebody (presumeably his son) takes over, and possibly reintroduces democracy, etc. Mexico and France are probably, if not bosom buddies, at least cordial, in a way that Britain and Mexico are probably not.
Britain and Latin America
I don't want to get too in depth here, because Brazil has a player and I don't know what he wants to do with it, but Brazil has clearly lost Rio Grande do Sul. Historically, the Piratini revolt was a rebellion against slavery and the monarchy, which failed in creating an independent republic of the Rio Grande do Sul. Here, its succeeded. I guess if the Piratini revolt happens as OTL, the British would be supporting it in a pretty heavy capicty, using their interests in ending the slave trade as an excuse to meddle. How Brazil goes independent is another question, but given Britain's close relationship with Portugal in this timeline, the UK and Brazil can't be too friendly.
Britain and Europe
Britain would be in an awkward position, at this point. No real allies in Europe, most of its actions would have been intervening in other crises and trying to throw its weight around whenever its convenient. With France engaging in a policy of strategic withdrawal in places, the UK would benefit greatly. The Italian Crisis, in the 1830s, probably had the UK putting its weight on the Austrian side, trying to push that into a weakening of Italian control.
Most likely, a resurgent Ottoman Empire would be of great interest to the UK, as a counterweight to its not-exactly friends in Austria and Russia (as happened historically). Britain has probably been a big supporter of the Ottoman Empire since 1815, and its probably feeling pretty good about its resurgence. However, it finds itself on the wrong side of the Vienna Congress, where the Austrians and Russians push through the weakening of Ottoman Power in the Balkans. Others start trying to get their dagger in - Venice, supported by the Austrians, succeeds in getting hold of Crete, whereas Britain must compensate itself with Cyprus as a naval base. The UK is smarting, but the end is not yet, and the Ottomans are still fairly strong enough to be, if not a British ally, at least close.
On the other hand, Britain has probably been a backer in keeping Germany divided. It's not beneficial for anybody at this stage to be greatly in favour of German unification, and Britain is no better. Since I've decided by fiat that Queen Victoria is born a boy, King Victor I, Hannover is still in personal union with Britain, though this means less as time goes on. British interests are hard at work in Germany, preventing the danger of unification.
Britain and Asia
We've previously established the the Panjab repelled the UK's forces at some point in the 1830s, which must have been humiliating. It's at that point that Russia's victory in this timeline's equivalent of the Great Game is secured. With a resurgent Khalistan thwarting British interests and Russia expanding southwards, Britain is forced to step back a bit and be a little more patient in regards to its interests in India. That said, the Indian Mutiny happens more or less on schedule, with similar results - the dissolution of the Mughal Empire and the BEIC, and the Victor I is crowned Emperor of India. The big difference, of course, is the loss of Kalat to the Panjab, but at least its a valuable buffer against the Russians, who know have Afghanistan in their pockets.
Britain was probably a backer of Japanese modernisation too, in contrast to the French who supported the Samurai currently in hiding in Ezo. The soldiers of Meiji's army are probably drilling with British guns led by British officers. Its possible that they are part of multinational interests, but the British are definitely involved somewhere.
That's all for now, I guess. Let me know if there's anything you're interested in or I've missed something, I'm a bit tired right now.