Yes, NaNoWriMo wiped my whole modding November, but I'm slowly getting back into place now. Leaving the zombie for a bit (I grew weary of that unassigned vertex that I cannot find), I tried the pegasus knight a while back. Unfortunately that one hasn't been going as well (not even as well as the zombie).
The pegasus is obviously a more complex unit than the zombie. I created a unit template from the base game horseman unit to use for the pegasus. I've attached basically everything I've done thus far, in case anyone more knowledgeable has time to piece together where I went wrong. The unit doesn't show up in the game at all (it's just empty space with an icon hanging over it) as it stands now, and I've run out of ideas for what that might be. I believe I remember reading about issues with the horseman model a while back, so it may be that I've run into those and my issue isn't actually solveable with this template.
I may have time to work on more unit stuff soon, but most likely that will be working with nifskope to fix up models first (so I've got a wider range of pre-CiV units to pull from) before importing many more units. That and actually getting some coding done, which I haven't done for my mods in way too long.