Yesterday I was flipping through my saved maps, cleaning out old stuff and duplicates. As I was scrolling through the VMF's I decided to switch types of maps to search for, to Hammer Autosave files.
Behold! I found an earlier copy of the map I 'lost' on the bricked hard drive. I did lose a custom blend texture, but that requires little more work to replace than typing this post. (actually, it takes less)
So now I can resume work on the third map, and I'd have to say this has actually been a good thing for the mod. Since the hard drive death, I've revamped and added bumpmapping to several standard HL2 textures, which adds several new color schemes to existing textures.
Aside from that, the storyline will be getting some minor changes and tweaks, and this page itself will see a major revamp with some HTML coding.