Even though the progress has not been as great as i'd of liked during these past couple days due to other work, I will document my progress whether it be great or not.
World of Level Design's tutorials share some useful techniques and workflows, one of which I will be trying to stick to during the construction of this hallway where I will remain in the unlit RGB render view for as long as I can, this forces my hand to focus on placement, distribution and scale without getting distracted by lights, reflections DOF etc.
I wanted to create a generic rock substance that I could later expand upon, after following this tutorial (https://www.youtube.com/watch?v=d4gA8FpYrHk) I was able to get the result you see below.
Documenting my current progress I can see plently I would like to work on, as a blockout texture I think this holds up well however some of the weathered effects will be dulled down a bit. A better bake from xNormal may be in order as a couple of bolts didn't render correctly