I feel offended about the Turkish units being "weak".
On a serious note, goodluck.
No offense, but Turkey called to help Britain and France because of weakness and bad equipment of their troops. Turkey soldiers were in the worst conditions in Crimea because of their bad supply and equipment, they frozen to death in hundreds, they were often used to deliver weights from Balaclava Harbour to English camp, and it is not surprising, that in battles they or didn't take part at all, staying in reserve, and also they often flied (as example, Balaclava battle began with Turkey soldiers flied and lost cannons, and Charge of Light Brigade was purposed to re-take these lost cannons).
But you can play as French Zouave and imagine that it is a strong Turkish unit, their uniform was very similar to Turkish.
And so Russians can also be offended because they lost this war, but it is history
One thing I want to point out are the weapons used by line infantry at the time. There were a couple of different rifles used in the Crimea and the issue is balance:
Britain: Pattern 1853 Enfield rifle-musket (rifled)
France: Pattern 1851 Minié rifle(rifled)
Russia: Models 1844, 45 and 55 percussion musket (Smoothbore) and some Pattern 1851 Minié rifle (rifled)
Ottomans: Models 1845 and 55 percussion musket (Smoothbore) and some Pattern 1851 Minié rifle (rifled)
Sardinia: Pattern 1853 Enfield rifle-musket and Pattern 1851 Minié rifle(both rifled)
As you can see the allied forces had more rifled weapons then the Russians had as the Russians of often only gave their foot guards the Minié rifle. This creates the obvious problem of the allies would have the advantage in a pitch gun battle due to their rifles. This would need to be carefully balanced so has to not under power the allies and not to over power the Russians.
Thank you for suggestion, but it is not total correct: only in British army were a lot of rifles (but it didn't stopped Britain to almoust lost Inkerman battle), Turkish army had smoothbore muscets and only few rifles, it will be no Sardinians because of their late arrive to Crimea and almoust not taking part in battles.
But most French soldiers had smoothbore percussion muskets - there were special troops with rifles, as "african" troops or jaegers, but main infantry weapon of France was smoothbore musket. As for Russia - main weapon was smoothbore percussion musket (often made from old flintlock muskets), but there were, as in French army, special troops with rifles, like Shooter Battalions or Plastuns, and also in each batalion of each infantry regiment were 24 soldiers with rifles or rifled muskets (6 soldiers per company), so Russian army was not so backward as most people usually think. The myth about backward russian weapons was made to explain why Russia lost that war (and it was because of bad commanders, not weapons)
And that's why I want to make only two factions - Russians and Allies, so Allies will be not over powered - there will be almoust equal number of rifles and smoothbore muskets (allies will have more rifles, but not so many to heavy thinking about balance.
Besides, rifled weapons reloads slower than smoothbore muskets, so in close distances smoothbore muskets even have advantage in shooting speed. And also it will be interesting (if as example play russianline infantry vs. british line infantry) to maneuvre and make the distance closer as soon as possible or charge bayonets (it was main tactics of russian line infantry anyway, and also we can give Russians more HP or add them melee bonuses).