This past saturday we runs a Frostgrave game with a post apocaliptic setting. Really only change the minis and scenery, we use the same basic rules but with logical equivalences (wizard as a mutant/ psionic, treasure hunter as a scavenger, barbarian as a big mutant, etc)
The game runs very fun, we played over 120x120cm table and with four warbands.
Here post some photos, enjoy!