More ideas from my fevered brain:
Every colony will start with a fort, it is capable of housing 24points of troops. The walls will support 12 figures fighting in each direction (subject to the points limitation). if a cannon or Gatling gun is mounted it displaces as many figures as it has crew plus one. If the field piece is mounted at a corner it displaces figures from both of the walls that make up the corner.
The model of the fort will be no larger than 12" square. In game terms it counts as hard cover (divide hits by two, rounded down) and higher ground.
We will discuss the price of forts, I want them to be relatively expensive to force the colonial forces to keep moving around to enforce the Sovereign's will.
I will build a standard fort, if you have a desire for a different design, and can draw it coherently, and it interests me, I will build a special one for you.
2. Supply Wagons
Supply wagons cost one point each, they will support 24 points worth of troops each week on campaign. Effectively a 24 point force will "consume" a wagon a week while on campaign. The supply column will be present on the table with every Imperial Power's force. Wagons can be destroyed by inflicting six hits on them either in melee or by shooting. Once a wagon has been consumed it is removed from the supply column. Loss of supply wagons will either foreshorten your campaign or lead to attrition among your troops.
3. Heavy Guns
As the game is designed the guns are small field pieces. Fortresses and siege trains may have need for heavier hardware. Heavy Guns cost 8 points each, shoot 48", have five crew figures and ignore two levels of cover. They move 2" a turn without limbers, 4" with limbers. There are no heavy Gatling Guns, but I am open to discussion.