Of Gods and Men is a Star Trek actors joint venture to make a movie for the fans and put it on YouTube. It's a ton of fun and introduces variations of the typical characters as well as three constitution class starships. One is the Enterprise M (a museum Constitution made in the Movie era), the USS Liberty (the last battered Constitution from the Federation after the "global order" takes over the Federation), and the GCC Conqueror (the alternate timeline version of the Enterprise).
Here's my take on them to further fill out the mirror universe. I added as many of the characters as I could and even snuck in an alternate Number One who wasn't in the show.