That's pretty much how it feels doing terrain changes to this area. I had to make sure to lock position and height of the buildings so they wouldn't pop-up on me as I raised/lowered/smoothed the ground around them.
A testament to my ass-backwardness, here I go again creating the final area(s) first. What can I say, I need to have these as the proverbial carrot to keep me driving the module toward them. It was the same way with Ruins of Kazatharis.
Sands of Solvheil Series
Design Document for Sands of Solvheil I: The Ruins of Kazatharis
Design Document for Sands of Solvheil II: Beneath the Hearleforne
Design Document for Sands of Solvheil III: Crusaders of Shalihir