I continued to build the Tahnok character this week, as seen in this render:
Much to my relief, none of the other pieces needed to be fixed. However, the model lacks feet and hand weapons (the feet need to have a structure added that will allow them to move and the weapons haven't been modeled yet). I also learned that the Subsurf mesh modifier can be rather destructive at times, so I need to remember to enable it in the viewport when I use it.
Having nothing else to do on Tahnok at the moment, I then moved on to adding materials and textures to an existing set for an upcoming production (please note that I did not model it). I haven't done much with it just yet, but here's a render of my progress: