Sometimes I think. What good would be to combine a game like Panzer Campaigns is an operational level but the outcome of battles with SP. Something like Medieval Total War 2 for driving the strategy and tactics in battle.
In this case you might choose a region, set up two opposing armies and create a situation.
With the number of players could play at the division level with three battalions per player (team). Bone with 3 players per team, we have a division.
Have done it before, probably 6-7 times over the last 9-10 years. Its not something that's really easy. You are talking several year commitment from everyone involved.
You can see some games I ran over the years where a few links still work;
Is very good. In some of that thought but it is certain to be difficult. You could implement some of these campaigns here?
Then see these links for more time to see how organized these campaigns.
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"We are free and nothing else matters"
Jose de San Martin.