@slip-capone
At the moment, and this could all change as I’m just now starting to tinker with this stuff, I’m thinking 4-6 factions. The map would represent an area of the galaxy explored by Humans. Each territory would be an area of space or a planetary system. Each planetary system would be worth a set IPP depending on what resources they had. Each would also get a “Planetary Defense Value” representing that it’s protected by planetary defense batteries (Ion Cannons, Lasers, defense drones, etc.), or they’d have large anti-ship missiles that could engage ships in orbit if they got to close. The smaller stuff could be used to shoot down fighter craft in near orbit, or if it entered the atmosphere.
Ground Units would include: Infantry, Marines, Planetary Defense Forces (Militia), Grav Tanks, Fire Support Vehicles, and Ortillery (Orbital Artillery). They’d actually land on a planet and conduct ground combat to seize it.
Fighter type space craft would include: Fighters, Heavy Fighters, Strike Fighters, and Drones. Fighters would be able to engage other fighters in space superiority combat (They’d have to gain “Space Superiority” before an Orbital Assault could be launched), proving support to Marine units making orbital assaults, close air support to ground units.
Spacecraft would include: Orbital Assault Ships (carrying Marines), Orbital Transports, Heavy Transports, Light Cruisers, Cruisers, Heavy Cruisers, Battle Cruisers, Escort Carriers, AKA: Drone Carriers (carrying a Drones), Carriers, and Fire Support Vessels (basically space faring “Arsenal Ship” with large load of surface bombardment missiles. the various cruisers and the FSV would be capable of conducting surface/planetary bombardment.
Ships could blockade planets (basically starving them into submission), lay minefields in orbit, to engage in combat with blockade runners.
Other units would include Space Stations, Space Docks, and Planetary Defense Stations.
As I’ve said, I’m just now starting to tinker with this stuff, but I’ll post more as I work out the details.