Here is rework of multiplayer map "War Plan" (size 96x66 hexes).
This is typical mirror balanced map, but there are some specifics.
1. You can only buy units in the main cities that are deep in the rear.
So you need to plan your supplies to the front based on your supply lines,
and should take into account both the direction of their attacks
and the defense against enemy attacks more carefully.
2. You can increase experience of your units on special hexes marked - A .
Move your units there and they will get some points of experience.
Infantry 35 exp cost - 3 prestige. Any other ground unit 35 exp cost = 8 prestige.
Any air unit 35 exp = 12 prestige. Naval 30 exp = 25 prestige.
Notice that you can train ground units only at the "ground camp",
air units at the "airfield camp", infantry at the "infantry camp".

Have fun!
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UPD to Final versions! 12.10.21
Map list -
1) War Plan
2) War Plan LT
3) War Plan TE
4) Millitary Plan
Added map War Plan LT and Military Plan in the same options