IC: empire building
I am tinkering with something. Not a straight copy of Civilization, just lifting some ideas from it.
Also from Pax Brittanica. Civilization is too big, broad and complicated to make a PbP copy of. It would take a year to write the rules.
So, this would be a fantasy campaign and involve settling and developing a single continent. Taking a cue from Game of Thrones there would be common threats as well as player rivalry. Much narrower slice of time.
There would be military units, and also individual champions who could be sent around to do this and that.