Here's a question - why do they make the boards so big? It makes sense to have lots of little boards ala LnL. There's a similar thing in Combat!, Battle Hymn:Gettysburg and Silver Bayonet - all big maps but you play on a fraction of them for a large portion of the scenarios.
Also - just a question to you hard core board gamers out there - when you are playing on a portion of the map, how do you frame off the rest of it?