Absolute fog: Can only see the location of your units and nothing else (including which sc you control)

1 Year Plan: All orders (Spring, Retreat, Fall, Retreat and Builds) are conducted in the spring turn of the year.

In other words say I was France in Spring 1901:
I would say:
Brest-MAO (retreat to Picardy-Belgium)-Portugal (retreat to West Med)
Paris-Burgandy (retreat to Brest-Gascony)-Belgium (retreat to Paris)
Marseilles-Spain (retreat to Piedmont-Venice)- Hold (Retreat to Gascony)

This would imply that Spring orders are:
Brest-MAO
Paris-Burgundy
Marseilles-Spain

Build Priority:
A Paris
F Marseilles
F Brest


Disband Priority:
A Paris (aka the army that was in Paris at the start of the year)
F Brest
A Marseilles

Now if Germany chose to bounce France in Burgundy, Paris would repeat to spring phase. So incorporating German units it could theoretically be:
Munich-Burgandy-Burgandy
Paris-Burgandy-Burgandy

Now if Germany's orders were this:
Munich-Ruhr-Burgundy
Berlin-Munich-SM Munich to Burgundy
Kiel-Holland-Belgium.

The Spring turn all orders are successful.

In the fall turn Burgandy gets bounced in Belgium and dislodged from Burgandy, so would retreat to Paris.

If (hypothetically speaking) Marsielles was dislodged in he fall, it would retreat to Piedmont and move to Venice (hence to move to Venice following the retreat option.

planning everything 1 year in advance could make for a really interesting game, however I am not sure if this mod is 'possible', but it is worth asking.