Thanks to all volunteers for the help, and Pocus and Gray Lensman for the help with my first dive into the modding world.

Quick and easy to install (Based on you installing to the base directory and drive):
1. Go into your C:\Program Files\AGEod's American Civil War\ACW\Aliases and delete the mdl_Alias file
2. Replace it with the mdl_Alias file from this zip.
3. Go into your C:\Program Files\AGEod's American Civil War\ACW\GameData\Models and delete all files
4. Replace them with the .mdl files from this zip.

Start the game and give it a go.