IMHO, 1:1 modelling gains you nothing from a functional perspective. The firepower is an internal calculation anyway, the frontage is right, and being at this scale permits you to actually see the figures. You want to do this 1:1? You can pretty much forget about ever SEEING the uniforms on the screen. It'll be a series of little black sticks marching in the distance. This, of course, is of a piece with the problem tabletop gamers face -- we love the detail of 25+ mm figures, but realize that TWO mm is actually the most appropriate height...even Siborne at 10mm is a bit big.
I wonder if some of this isn't about the concern that the battlefield looks too spread out. If it is, then I commend to you a visit to pretty much any battlefield but Waterloo which was something of an oddity. Walk Austerlitz, Jena, Eggmuhl, Leipzig and the like and realize that while local forces may have been dense, the "helicopter" view would have shown them pretty well spread apart.
Best,
Jim
"Cyrano"
:/7)