Sorry lots of questions at the same time are difficult to answer.
1) Your UI stuff mostly looks fine off hand. Is that file in the Assets/UI directory? It's possible that you have just placed the widgets somewhere where it gets covered. You could increase your draw order to a much higher number to see if that is the problem.
2) The game isn't setup to use animations from one model on a different model.
3) skn files are just text files telling the game which texture/shader to use for which surface on the model. Most models only have 1 surface though.
4) You would probably want to use overrides instead of addsTo, but I'm not sure the code is going to let any random NPC go renegade.
Depths of Peril, Kivi's Underworld, Din's Curse, Drox Operative, Zombasite, Din's Legacy, & Drox Operative 2