I just spent the last five hours of my day playtesting the rules for building kingdoms in Pathfinder’s Kingmaker Adventure Path. After 2 years passage of time, my kingdom had three cities, a population approaching 20,000 people, and was fairly stable (and incredibly profitable.) I’m concerned that there’s not a lot of improvements that increase your Stability (your kingdom’s “statistics” are divided into three – Economy, Stability, and Loyalty. Economy determines how many resources you can generate, Stability how well your kingdom holds together, and Loyalty how loyal your people are to you.) And considering that you’re making Stability checks at least once a “turn”, this is something to keep in mind – building too fast might lead to rampant unrest, so while it makes sense to focus on the Economy at first, the middle “level” for your kingdom will be making sure you’ve got Stability as well as Economy. Also – I haven’t had to make a single Loyalty check yet after 25 turns. I wonder what that’s about.