I personally prefer more general rules. One might think of points in general. For example:
1) Map (size, terrain, visibility ...)
2) Point of purchase units
3) Restriction of units (size zero, air points, armor .....)
4) Location of VPs
Interestingly suggesting Cross, but it seems very detailed. I think the less rules the imagination flies. I also think that in war there are no rules.
If players want to recreate a special field for battle if it can create more detailed rules.
Greetings