Sounds very promising : )
I like the idea of being able to add more soldiers to your squad. In the current version I can't afford to lose any of my soldiers and I keep restarting the battle until I manage to win it with all of my soldiers surviving. Your draft could bring back some of the the good old x-com strategy: train a core of good soldiers and hire normal soldiers to provide back up - and who can be reemplaced if they are killed in a battle.
Personally I don't see any need for equipping gunsmiths and armourers. This could turn the game into another "gain resources and start to produce goods and weapons" strategy game. I suggest to keep the strategic part simple. Collecting taxes and hiring people etc. sounds good. But I think it would be sufficient to be able to buy (or repair) weapons in bigger cities, without having to take care of employing and equipping a gunsmith. Until now I actually never have bought (and very rarely repaired) a weapon. The weapons dropped by dead soldiers are more than enough to equip the own squad.
Non-aggression agreements with stronger clans seems an interesting strategic element. Have you thought about other types of agreements too? Maybe instead of non-aggression agreements players could also try to ally to another clan and not have to pay tributes. The player than has to join this clan in battles (maybe against an enemy both have in common) to gain reputation. If the player's reputation with the clan is good, the clan won't attack, but if the reputation is too low, the clan will abandon the agreement and start to attack.