Some drywall and framing was demolished around my gas fireplace during a drain tile installation. It looks like the framing/walls around the fireplace are built on 2x4's with fire resistant drywall on both sides — i.e., inside the cavity.
This isn't quite what I expected to see, just given the tutorials I've seen online. I was expecting 2x4 framing inside, with clearance from the fireplace, and drywall on the outside only.
But, is this the normal, necessary, or safe way to do this? Or, does this look like it was an over-precautious DIY project?
What do I ultimately need to do to restore this safely?