Not all cities are equipped equally with AWs or have the ability to whip out PPs on a whim. Some are a bit real estate challenged, as I was (still am, actually) but built and leveled up one each of the Sentient goods Manufactories one at a time using time instants on the later levels but still somewhat of a pain. Then, as suggested here, teleported them back and forth as demand required. Took just a bit more than 5 months with that strategy but I'm thinking this may have been a "test" chapter for Inno, a way to slow down players who are capable of zipping through them in a matter of weeks. I believe that Inno may have realized that the chapter 15 requirements were a bit much but too late before rollout (Do they not even listen to the Beta players for Pete's sake...I mean this supposed to be the sounding board for the next chapter rollout). Too late for chapter 15 mods as too many players have already braved the impossible. Chapter 16 is very easy by comparison and now chapter 17, is killing us on demands for Orcs and Mana (especially...and a bit unrealistic numbers here). But these numbers may be adjusted going forward to the next chapter. Hard to tell. Maybe Inno won't listen to input from their Beta players for the next rollout either...