I'm partway through making a mod of Apocalypse with Apoc'd. It is partially a balance mod, like karadoc's, but it comes at a lot of things from a different direction. About the only thing that's really the same in both is that Toxin A and Toxin B don't ignore shields. It also addresses the issue of some UFOs being literally worthless to research besides points, while others are completely required; the quantum physics tech tree has been massively revamped so that several different UFOs are capable of unlocking a given tech (the Mothership does have a couple of unique techs associated with it, but they're not necessary for victory).
One thing is bugging me, though: is there anyone besides me to play it? I don't see a lot of people posting in this board, and I don't really know any other boards where there's an active Apocalypse community. It feels kinda silly to keep making tweaks if no-one's going to enjoy it.
So, uh, post here if you actually want a magic9mushroom-flavour mod. Or know somewhere where I might find more people.