@ramon
I have another one of my FFA maps working with Sea Zone PU going to the owner.
see
https://forums.triplea-game.org/topic/2467/settlers-fallen-empire-official-thread/15
Note you will need to do steps
player none=Neutral must be have an initial relationship of Neutral with the Player factions, see lines 6977 etc
player none=Neutral start of turn 1 is changed to War, see lines 5913-5931
The above is a bizzare requirement that should not exist.
I still cannot get 1888A Steam & Steel to work, but Im hoping you have success and then I will raise this with the Devs.