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.
Yeah, seemed like the anime trilogy was full really interesting ideas that weren't utilized properly.
Hi! Yup, it isn't indeed meant to be like the Gotengo. I needed a bigger ship that would stand out next to the others, and nothing stands out like a giant drill.