I wanted to run a campaign of fantasy mecha combat.
Bunch of options for your mecha, each with different advantages
>How parts are animated magically vs mechanically
>Which materials is it mostly made of (stone, clay, wood...)
>Carefully sculpted vs rough materials
Combat including
>Mech vs mech
>Mech vs giant fantasy monsters
>Mech in a battlefield, vs troops, siege weapons and other mechs
This is something I may still do, honestly, but I'm not too sure where to start for the combat system