RTF is a global modification that replaces all towns in the game.

a swordsman and an archer (on an elf)

I think it would be good to create something similar:
1. Rogues - based on a peasant
2. Mercenaries - archers, based on a scout
3. Pirates - can be borrowed from NCF
4. Free Mages - based on druids (or can be based on a monk)
5. ?
6. ?
7. Thunderbirds

Added 1 minute later
As a city, you can take an old church + unused objects (tents, an old human city, etc.)