Superb diorama would love to see it and discuss in depth with you, how many figures displayed? I'm in California this October but that would be some hike to Seattle and my itinerary is pretty tight.
I have also been told by many colleagues that I must dismantle mine out of the loft and display it at The London Toy Soldier Show in December, but as you must be aware the effort to dis-assemble and re-assemble would be enormous and I am not too sure whether the interest in the US Civil War is that prevelant in the UK let alone Brits coming to view a toy soldier depiction of the first day of a battle the majority have never heard of.
How do you find the interest in the civil war amongst the public at large in the States? as I did notice a "little angst" in one of your posts re: getting them interested in coming to view.
However, an outstanding achievement leaving this UK civil war buff (maybe the only one) mighty impressed.
After reading your message here, let me answer your question about interest in the Civil War in the USA. In the South, where I am from, there is a little saying that many repeat that "it's not over, we're just regrouping". There is major interest in this part of US history in the South and Northeast, since these were the major areas of battles and enlistments for battle. I havent seen your diorama but I will be on the lookout for it now -