I am on day 28, 135 residents and 26 workers. All the food in the world and 5 free building slots. I build things and workers take the resources there, then the building sits at 0% forever. I have three towers and a barracks like this now. Ive been experimenting with location and it doesnt seem to matter where it is. I CAN make wells and some other mundane stuff, so it appears to be defense buildings?