Just looked at the code and Guild Towns is not for a PK server. It about guilds building towns, buying NPCs and making $$ that way.
Factions is a good PK world though.
- can't leave staging area until you join/create a faction
- all factions are at war
- factions can claim all the land they can afford
- leaders set the player image
- can build tames/golems easy for defense/attack
- you can unclaim enemy faction land and basically destroy them so they can't spawn back in
But if you don't want it then that is fine. Just something different. I can still do invasion on a normal PK world
