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Peter Heath, who used to have a company called 'Anschluss Publishing', selling wargames rules and scenario books, did Leipzig at 1:20 ratio using 6mm figures. It was something to behold! Was photographed extensively in Wargames Illustrated at the time and we had the pleasure of having our game next to his at 'Warcon' in 1992ish.
Out of interest, what rules would you veterans recommend for 6mm big Napoleonic battles?