I have posted a rough draft of the official Design Document for Beneath the Hearleforne complete with images. While there are still many details and statistics to flesh in, this has the basic structure and placeholders for many integral elements. It also features an expanded section on religion as many elements have been brought to light thanks to the events of The Ruins of Kazatharis.
I'd like to have this looked over with someone who is really good at number-crunching at games. I need an Encounter/CR/Experience Statistician or something. I'd like the combat in this module to be a little more intense with more close calls than before without stacking the deck too high.
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