I agree that the attention to detail is very compelling, but I want to note that drill from the book is not always drill on the field. For example, drill manuals will often have the musket held very close to the face while reloading. Anyone who has fired a musket knows that this is impractical and dangerous. When firing, I imagine the NCOs cared more about speed of reloading than exact for (that is when it came to actual combat.)
Also, I note on kneeling. I was afraid that it would be very hard to load fast my first time firing kneeling. In fact, while it is very different and note quite as fast, it is not hard and is much easier than one would imagine. I would recommend to manufacturers, however, that they refrain from producing kneeling positions unless they are specifically depicting a square or are portraying a light infantry unit. Light units often fired from the kneeling positon for extra cover and increased accuracy. Many, however, only fired from the kneel and loading standing before taking a knee.
-Sandor :salute::
(I am a reenactor, by the way)