About the colony.I agree that in the imagination it looks exciting.
But. How can you build gameplay around this? how to create problems that justify the appearance of this? What should the opponents do that you could "protect" these colonies?
Each game feature must be integrated into the gameplay.
By allowing the colonists to perform tasks that the player otherwise would. So, for example, you could have:
1. Farmer - assigned a plot they would regularly harvest whatever was planted there.
2. Crafter - assigned a station they could "watch over" anything ordered in the crafting stations and deliver it to assigned crates.
3. Doctor - would attempt to heal/cure any colonists hurt or infected.
4. Guard - would statically guard certain points and/or walk assigned patrols.
5. Builder - would build structures to blueprints. Would repair structures needing it.
6. Miner - would ride out to selected points and mine for selected materials (lead, shale, nitrate etc). Could be accompanied by guards, could even use a designated vehicle.
7. Cook - would cook meals as required (say, to certain stock levels).
Each colonist would need to be, consequently, clothed, fed, guarded, housed.
Now, perhaps even none of this is feasible, or even possible, but if we're talking colonies, this would, I think, make for very compelling late-game game play.