Warzone "Empire" rules were a project I was thinking of picking up, but never really got too far along with the idea.
Here are some general concepts that I had hashed out concerning the rules.
Individual unit activation using a "chit pull" system. Alternately, use a deck of cards with each unit assigned a particular card to indicate activation.
Command would play a role in the game. Units would have individual commanders, and if the commander got hit, the unit would lose activations, and lose a morale level.
Leaders for each unit, and for every three(?) units, you would need a Wing Commander - Could adjust up or down depending on the faction.
Overall or Wing commander get's hit, all units in that command lose a moral level.
To differentiate various troop types, you would use range, defense value, attack value, morale and movement. Compared to UWZ, you would have to abstract some of the abilities, such as infiltrate.
Spotting rules with dummy unit cards would definitely be a part of the game.
Actual AFV's would and could be modeled at this scale....TANKS!
You could also have some on board light artillery, as well as offboard.
Close combat would need to have casualty tables to reflect the effect to both sides in a melee. Hand to hand should kill both defenders and attackers.
As a unit take sufficient casualties, it loses moral level. (I know that we as tabletop generals assume every unit will stand and fight to the last man...troops in combat have a different viewpoint)
When the unit is shaken, it would need to get out of enemy fire before a morale check could be made. Either hard cover or out of range of enemies.
If a unit breaks, surviving members would have to get back to deployment area and be free of enemy fire to rally. Failure to rally would mean unit is out of the battle, and the entire army loses a morale level.
In a platoon/company level game, I believe the game should be less about overall kills, and more about disrupting command and enemy morale. Casualties would certainly be the way to whittle down the enemies will to fight...but targeting enemy commanders with snipers would model what happens on the battlefield, and make for totally different game.
Feel free to take or leave these ideas. Good luck with the rules, sounds like a fun project.