Nice to see the Ural Cossacks and the range continuing.
Not sure what completion entails as with some manufacturers it is two sets of infantry. Once you start with the detail Strelets have given us in the Crimean range then there could be more. I suppose Strelets could use the French set as a guide for other field artillery sets. On the same theme the Napoleonic French engineers poses could be modified for the Crimean War. Like WWI the saps of all parties were raided when they were being dug.
I wouldn`t mind seeing some Sardinian Regulars, Turkish Artillery and some transport sets especially the Tartar carts used by the British who were so badly organized that they didn´t bring any transport with them and had to rely on what was locally available. Russian wagons would be very useful as well.