Fictional WW2

For a video game hobby project: what game design ideas would you have for a setting in fictional WW2 and past? So I am thinking monstrous vehicles and over-the-top weapons and environments. Units-battles no soldiers. Huge fortifications and units like armored trains, advanced Zeppelins, landcruiser-sized tanks and so on.

Here some game assets as examples: https://youtu.be/bMlaZDyvobc