I was responsible for the majority of the architecture in peak pass. To make my life easy i created simple trims and bake them down to geometry. I then used these pieces of geo to stitch together most of the architecture in peaks pass. Using 2 uv channels and vertex paint to blend the seams together. This allowed me to create countless number of very specific pieces of geometry for each of my areas, keeping everything at 512 pixels per meter. I used the same technique for a lot of the scaffolding. It was an overwhelming amount of worth but totally worth it.
In the end, i used "skirts" to blend the rocks and the architecture seamlessly. Unfortunately this process takes a lot of time so i had to be very selective.