Very nice looking game. I don’t live too far from the South Mountain passes so nice to see the battle on the tabletop. Another Union victory wasted by McClellan! What did you think about the Longstreet rules? I am thinking about buying them. From what I read I did not think they had skirmish/open order formations but it looks like you have a Union unit deployed in open order.
Love the layout! My favourite period as it was the first I ever war gamed properly back in 1971. I think it is the diversity that makes the ACW an interesting conflict, from Napoleonic style lines to trench warfare and the western and Eastern theatres. I use Honour and Glory for 20mm games and good old Fire and Fury for the 15mm.