Might never get there! I will consider the collection "complete" if I get all the emperors who actually ruled over the city of Rome with some sort of generally accepted legitimacy. So for now I'm going to exclude Eastern-only emperors too. Once that is accomplished (if ever) maybe I'll attempt to add usurpers.
The third century, the 200s, were chaotic enough. The 300s and 400s are probably worse. I did bid on one post Constantine I piece and didn't get it. I am looking at a couple of others. They are usually low priced in the circulated grades, but one looks to be Mint State, and the dealer has a high minimum on it.
Got here late; everyone else said what I would have. But, this is an Incredible start. @Roman Collector's post strikes me as sage advice. But your writeup is ample evidence that you know what you're about!