Humans can be a resource. To produce combine soldiers you need more Humans.

yes, good idea

The following are suggestions:

1. After all, it is a work of the same person, and you can add your own ideas and innovations as well as those of your fans. You don't need to be rigidly bound by the original setting, although there are many unclear places in the original setting.

2. We can make better weapons and equipment systems. Instead of using only half life 2 weapons, we can use more weapons of modern human forces, especially the resistance forces.

3. As mentioned by several guys before, you can go to the game makers of Old World Blues and Millennium dawn for some help, and you can also refer to these two very good modules.

4. As for the combine, they can join the mobilization troops. This is the setting of the half life 2 beat version. A national policy can be set. With the passage of time, they can choose to use the reformed troops to completely replace the mobilization troops. In the half life 2 beat version, the reformed troops coexist with the mobilization troops. But later, the mobilization troops launched a large-scale uprising, and the situation of the joint forces took a sharp turn, Therefore, it is possible to set such a national policy, and there can be bifurcations. One is to choose substitution. The reformed troops will be more loyal, because they are forced to brainwash after being reformed, and they have no independent thinking. The disadvantages are here. They have no independent thinking, and can only rely on the combat copy. However, the combat copy of the reformed troops is rigid and inflexible, and the cost of transformation is also large; The mobilization troops are composed of 100% of the pre war human army. They have independent thinking, and their tactical strategies will be more flexible. The officers of the pre war army will also be more familiar with fighting with the human army, and the cost is also small. They can use many equipment of the pre war human government army, They are also human beings. Most of them do not want to submit to the rule of the United Empire. They are likely to organize resistance activities in private, or do not carry out the orders of the puppet regime established by the United Empire on earth. When the resistance forces gain an advantage, they are likely to choose to revolt and overthrow the puppet regime of the United Empire on earth.

5. The resistance forces, the resistance forces can set up more different forces in various parts of the world, and they can also have different ideologies. For example, in a socialist country before the war, the ideology of the resistance forces in that country will mostly be communism. For example, in a capitalist country before the war, the ideology of the resistance forces in this country and region will mostly be capitalism. Of course, Countries that are neutral or have different ideologies before the war will also have resistance forces of different ideologies.

6. You can refer to the settings of the half life 2 beat version more, which will make the plot game more interesting. More events and resolution plans can also be added, such as: the combine encircles and suppresses the Resistance Army or attacks the resistance activities of the Resistance Army, or the establishment of checkpoints, strongholds, outposts, bases and other facilities in the suburbs, or the planning of urban uprising and resistance activities by the Resistance Army, searching for the armaments of the pre war government, helping civilians to reach the base of the Resistance Army, searching for pre war technology and weapons, Raiding and occupying the facilities of the combine in the suburbs.Resistance forces can also form their own governments when they reach a certain stage of development. It is also possible to set the orthodoxy. For example, the resistance forces formed by the remnants of a national government and its armed forces will have a higher orthodoxy after they re form a government. The established government can be communist or capitalist, neutral or coalition.

7. The protagonists of the Games in the half life series can include the protagonists and forces of different human modules, such as Adrian Shepard.

I'm a fan of half life series. I'm glad that someone can make the game mod about half life 2 in steel ambition 4. Thank you for your efforts and dedication.The idea of more rebel forces is very interesting. We can do some other rebel forces, such as the remnants of the United States Army before the war, or the remnants of the five permanent member countries. Well, I wrote a novel of half life 2, which contains the story of corporal Adrian Shepard. It tells that when he woke up and arrived at the base with a group of Hecu special forces, he found that the base was empty, Finally, Shepard took people to leave the base to explore the situation and save the suspicious rebels. After returning to the base, he found Sergeant Barnes of the former Hecu. He knew that it had been more than ten years. Shepard and the Hecu special forces that had been evacuated together, because they were stopped by GMAN, did not recover until more than ten years later. Then came the story of corporal Adrian Shepard leading the remaining American soldiers to resist the United Army, The equipment left by the military base before the war can enable them to better organize resistance activities. It is suggested that the author can make a new weapon system when making the new version, and can make some human's weapons instead of all half life 2 combine's weapons.Because my English is not very good, I use machine translation. If I can't understand something, I apologize to you, but I still want to give suggestions. Your module idea is very good.In the end, I wish you a smooth development of this module.

Didn't the combine conquer all of Earth and not just Macedonia?

What if, for example, we gave all land to the combine, except black mesa, give them cores but massively reduce the number of factories and population in the world? So instead of 1 bilion people, they would have about 30 milion core population, because of the seven hour war.

The Rebels would get new focuses, called "Spread the Resistance" which would remove combine cores and give cores to the rebels. They'd also be called "Secret Base" instead at the beginning of the game and later be renamed (to Rebels) after completing "The Uprising Focus" - No Step Back style. You could also add a paranoia system, where each focus adds paranoia, and you have to be careful as to not be discovered by the combine. Maybe you could also give them focuses which give manpower and / or local population and / or massively increased monthly population. It'd also be nice to see focuses like - "Study Combine Tactics", "Anti-Strider Weaponry" and so on. Those focuses could give attack and defense bonuses against the combine empire. And maybe some focuses that give debuffs to the combine, like +10% attrition, -50% recon.

The Combine should have 3 national spirits - "Harsh Repressions", "Unstable Rule" and "Combine Technology".

First of all - "Harsh Repressions": -50% monthly population, -20% war support, -10% daily compliance gain, -10% resistance target, -50% civilian factory construction speed, -10% consumer goods

Secondly - "Unstable Rule": -20% stability, -50% political power gain

Last, but not least - "Combine Technology": +10% attack and defense, +10% tricleback, +10% division speed, +10% division recovery rate, +10 org, -15% org loss when moving, +20% fort construction speed
(Or maybe the bonuses start out small, and the combine upgrade this national spirit with their focus tree)

Since The Combine killed most of humanity in the 7 hour war, they don't have a lot of manpower. Their focus tree would focus (no pun intended) on solidifying their rule on Earth. Giving them manpower from the homeworld; fixing their national spirits; giving them civs and mils; taking care of the antlion and headcrab infestation and eventually, crushing the rebels

It's mostly up to you what you do with this mod, it doesn't have to be "historical"