Hmm, the only thing I noticed was your opening post saying it had been 180 years since the bombs fell. If you switch that to 200 you should be good.

Letter Bee's specific things he did with New Vegas essentially has the Courier overthrowing all of the factions and taking over New Vegas, but after 20 years they became just as much of a tyrant as Mr. House was. So, think of it as a slightly more evil version of the Independent New Vegas ending.