Are you sure the primary group that visits this museum is 3rd, 4th & 5th Graders? I understand how schools will use local museums as a field trip for their children. However, from my experience that only happens once a year and by only a few of the schools. I've also learned that the majority of the children don't fully understand the history of the Civil War as it is barely covered in their classes. It seems hard to believe the Museum Staff would design their gallery around this group.
Another comment suggested that less items are better. I agree there are some museums that are cluttered with items everywhere. That is distracting to most of the public. Of course, for most people in CTW, we would look at every item we could. The opposite extreme is to have fewer items no display and more written history. When I attended the Holocaust Museum in DC, I was frustrated trying to read all the text. People were bumping into each other as the shorter or elderly folks tried to position themselves so they could better read it. Further into the exhibit, this seemed to have improved as there were more items to view.