I’ve only ever come across the maps on line, plus descriptions of the campaign by people who played/know someone who played. As I understand it, the Murat wargamer campaign was a colossal undertaking - basically fighting every theatre of the Napoleonic Wars simultaneously with a lot of players and their combined figure collections: Something far beyond myself or my group.
But, the maps are superb for a homegrown wargame campaign that requires point to point movement at this map scale. I remember getting in touch with the owner of the maps a few years ago, seeking to reproduce them on my blog so that people could understand what was happening and he was very gracious and helpful to me. Perhaps, if you want his rules, you could get in touch with him - no harm in asking. I’d help you here if I could but, I’m at a loss to remember his name or how I found his contact details (it’s an age thing). Funnily enough, it might have somehow been through LAF.