A while back, I started to make a mod for Morrowind called Better Tribunal MQ which would have allowed the player to meet Sotha Sil (thanks to Arcimaestro Antares’s fab model), but got lost in the worlds of Oblivion and Fallout 3 and gave up halfway through. Ostar picked it up and worked it into his Less Generic NPCs mod, to which I had contributed a few bits in the past.
Download Less Generic Tribunal for Morrowind at Nexus.