There seems to be an issue with golems and the Ironeers. I have researched the appropriate technology. When I go to design a unit, I can pick Iron Golem as an option, and design a unit. However, it does not show up to be trained in the training menu of a city. 

EDIT - Actually, after I design one, it disappears when I got back to the training menu. That is, I design and iron golem, I go train it, it is not in the list, then I got back to design list, and it is not there either.