I'm glad you enjoyed it. And yeah, the Imoogi and the erzats-Gotengo is a reference to how most people assumed the Imoogi was Manda.
As for the city being part of the battle, that was kinda the core of what i wanted with this season. It's essentially a reimagining of MechaGodzilla City from the anime trilogy. I really like the idea of a city that actually fights back against Godzilla, and wanted to do my own take on it.