What a great and helpful guide you've written. Respect.
Just updated it!
Why didn't you share the URL to sign up in the article
World of Level Design has a new 5-part tutorial series on building Abandoned House with the help of CS:GO SDK version of Hammer Source. The series will guide you through all the essential steps of constructing a complex scene: block-in, texturing, detailing, foliage and other important details.
The guide can be applied to any game environment created within Hammer Source.
1. BSP BLOCK IN
4. DISPLACEMENT/TERRAIN AND FOLIAGE
5. BEYOND THE HOUSE, LIGHTING AND FINAL COMPILE
You can find other details on the production process and comments from the creator along with the thorough written tutorials here.