Huh?
I have nothing against your ideas of Medicine Halls, Training Grounds and the likes. I like the idea of adding specializations to regions.
However, I truly don't understand why this would be tied to guilds. The overwhelming majority of the guilds in game have no links at all to troop leading in the first place. This feature would tie them in to the military/economic game in a way that is, imo, not needed at all.
I would much prefer to give these options to estates, for example, than to guildhouses.
