Hi!
I suggest that the team as soon as possible takes a look at changing some of the terraforming options. Like in the situation showed in this picture, there are no way of flattening ground so that the wall we want to build actually follows the natural ground, and we can make the gatehouse in the end to the left.
The only way to flatten here is with a downward slope, and the wall of dirt will be so high that by the time we reach the bottom; no room for a gate. This can be fixed with something like "flatten ground natrualy" or something.
Also, being able to remove stone, and still build on it should be an option. Not just dig a tunnel and block the tile for terraforming.
Hope you take this feedback, and actualy work towards a better way of terraforming