Ok, I think I definitely broke the mod at some point, since shooting arrows at the welkin switches don't work. The funny thing is that I managed to finish the mod. I had the final encounter (I tcl'd through the last portcullis).
The more I read this thread, the more I believe I did something wrong. The arena for example, I never fought in it, as soon as I was in the middle, I was teleported. I did see some dude/monster in the spectator area... It must be some mod conflict on my end. Despite that, it was a really neat dungeon. I was prepared gear wise, but food wise my poor dunmer left the dungeon famished, thirsty and exhausted Good thing you're teleported back to the Tiber Spetim hotel