We should be able to impose severe limitations on the siege tower's deployability. Anyone know if this is possible?
In reality, walls were built on slopes precisely so that siege towers could not be used there, and so the defenders would know precisely where the siege towers would be coming.. So if a wall had 20% facing perfect flat ground.. and 80% facing slopes, it was a very fair bet that the siege tower was coming in the 20% direction, and you could build the city walls around that fact. They would expect nothing more than ladders to be used on the walls placed on sloped terrain.

The calculated path of the siege-tower was always prepared 2-3 weeks beforehand. This was done by small rolling shacks called "chelones" in greek, or "testudo". Turtles essentially. Engineers would be digging the ground underneath these rolling houses, and making the terrain perfectly flat, and would fill in any ditches that were in the way. Indeed, the EXACT PATH of the siege tower would be known to the defenders many weeks before it would even come. And so I'm happy with the deployment system in vanilla RTW, since the defender always sees the attacker's positions first, and can deploy accordingly.

What I want to see most of all are siege works, such as the greek "periteichismos" (encirclement) which were walls (sometimes twin) built around a city they were besieging. This was used multiple times, even by the Spartans at one time. Athens built a periteichismos when they besieged Syracuse in 415 during the Peloponnesian war. The Romans used it when they were besieging Lilibeo during the 1st Punic War.

Let's just say that Julius Caesar's "circumvellatvs" around Alesia was by no means a new thing when he was employing it..

Is there any ideas on how this could be achieved?