Yes, I am starting to work on this mod again. Underhell was a big inspiration to me because it taught me I was going to fail. So I didn't have to try too hard. In all seriousness, though, I am still going to do my best. And I planned out a few more things to add. My mind is much more resilient to the work and open to new ideas.
I experimented with Source 2013 and think that's too much trouble. I mean, there are a few entities I could add (and plenty of existing Valve ones that I could fix), but that sort of seems overkill for a mod of this size. I'm going to stick with making it for ep2.
I wish I had some screenshots to show you but there haven't been many new areas mapped yet, and I don't want to spoil everything or bore you too much.
I'll keep you all up to date. Thanks for reading.