Not really related perhaps, but I recently tried to make a western style map using FDF.
The buildings are a problem, no saloon style places really, the player models often dont fit aswell but either way.
I did manage to find some weapons that fit quite well, the mod has a shotgun, sawed off shotgun, winchester and some rifle named Ukkopekka which already makes the sound of a wild west rifle, plus some other guns that could fit.
It's quite nice for a shoot out style map, I think that if you used those guns from FDF you'd perhaps need to make some character skins and buildings to fit the era and you'd be done already.