@TheDog
Hi Dog
I'm guessing you're referring to the Expansion mod me and the guys play "Global 40 Expansion UHD Boxes". I would just give it a complexity level of 1 higher than whatever the Global 40 OOB game has.
Edit
I guess something like this is what you're suggesting ?
Global 40 Expansion UHD Boxes
It uses the UHD Mega Map based off of the Bung,Veqryn "World War II Global 1940 2nd Edition" Map.
This is a House Rule Mod for "World War II Global 1940 2nd Edition". It was Created by The Captain and Company