No offense to the developers for this mod, but it is a terrible idea. If you REALLY want to go all out, add the pacific or something like that but it isn't a good idea to change all the way to modern combat, especially since there would be like NO urban combat that would look accurate to today.
I have a friend that has an idea for an old C&C Red Alert Mod for COH, but I don't even know if that would be a good idea either. It's hard to mess with a game like COH.
it would be quite possible, RA1 was set around the time of WW2, maybe about 5-10 years after but same period so it works rather well.