Just thought i would share this with you all. In UE4 there is a tool called World Composition. A tool of that is World Origin Shifting.This shifts the scene / World origin to 0,0,0 every time the player moves so far away from where they started from.
Here are the PhysX docs on this feature.
I am bringing this up as I noticed on your trello road map that Coordinate remapping was mentioned. I just want to save you some time and work. It also works in Multiplayer. See this Pull Request that was merged a while back.
Have a great day,