I'm going to test an existing mod to observe its behavior; indeed, I've noticed that the Atlas Tools Kit seems designed for mods built with the most recent versions. So I'd like to check whether it still works with an older mod or if it needs adjustments. I also have my own mod (made up of 20 files); @Grautvornix how will the output process work with my mod ? 

I saw that you cannot use the -w flag with using the .spec files @Grautvornix, so I think just building from the .py files will be ok. Was there a specific reason you did the .spec files? Here is an update version of the build script: build-1.0.1.zip

Cool! But does that script work?  (shouldn't it be e.g. "pyinstaller mercator.spec" instead of "pyinstaller mercator.py" ?) Now that is a challenge! No, I don't have any yet, possibly something like the attached (still ugly with the tongue hanging out) 

build.zip (remove --onefile from build script so it doesn't take as long to run the program)

@Alber 0A.D @AsherI like your proposals! If you have options to recover from an almost total defeat, this addds a nice twist to an otherwise straightforward win/loss result. Part of it seems possible already  I keep seeing single ally's units garrisoning into my CC etc. It is just not a strategy I was using so far. Wonder if we can build that into a mod for testing...