And as usual i will be here to complain and point you in the right direction.
Dont forget to use the stuff from your TWTEAW. They are quite fitting in the era. Plus it's easier now. Most artillery still has the older architecture (that is, a chassis, an axis, two wheels, the gun and a levie to be dragged). No machine guns of any sort etc.
Now, coming to think about it.... what kind of tactics shall be represented? Surely we still have the frontal assault who, even with breech loaders were quite effective (except Pleven... there it was.... oh well). But even though it was "line" infantry, the said line wasnt exactly a tight phalanx similar to muzzle loading warfare, and besides, now soldiers could kneel and fire. Good representation of that? Perhaps using the animations from TWTEAW, but in different formations?