After playing this game with the Colonial Charter and New Medieval Town mods, along with the City Roads mod, I got an interesting idea:
This isea is based on how these two mods use a progression system in which you start your game using vanilla content, and as you gather more people and resources, you can expand into the new productions and buildings. This creates a sort of "technological progression."
Now, what about taking it to the next step?

What I came up with is an idea for mod that builds on Colonial Charter and Medieval Towns, and would add buildings for later eras, such as the Industrial Revolution, and even as far as the modern era!
What I think would be unique is if you start the game as vanilla, build up your town as usual, bring in some Medieval buildings, resources, and professions further into the game, then eventually progress to the Colonial era with the Colonial Charter mod, then continue toward the Industrial era. This would bring about new roads, such as rails. Later, as we advance closer to the modern era, we get resources, materials, and buildings needed to build motors, and then, motorized vehicles. This brings about new, modern roads. We can then advance into a faster-paced, fully modern, era.
Extreme-late-game would see cities with vast road and highway networks, tall highrises, and countless people.


Now, I have no idea how this game actually operates, in terms of the game engine, and I have no idea how to make a mod, I just came up with this idea while playing with other mods. What do you think of such an idea? Is it even possible for this game? How do you think it would look and handle? Have you ever had a similar idea for this, or another, game?