There have been mods attempted at doing this but they seem to run into an endless string of challenges and problems. I would imagine while designing this game it would be much easier just to input the data rather than attempting an entire reconstruction.
Here is my wish list for this and other strategic level games.
Give the option of one week and half week turns. This changes the dynamic of the game immensely and allows for many more operational decisions. When you are locked in to a two week turn the feeling of being hamstrung is palpable. One week turns may not be everyones cup of tea but knowing that an average infantry unit covers approximately 20 miles a day in the narrow confines of the Virginia theater is crucial to operational decision makeing. The Western theater does not feel it as much but in the narrow geography of the East it is on this level (and sometimes days) that strategic decisions were made and based.
I love this game - my 2 cents anyway