World Composition and Level Streaming

From what I have gathered, it appears that world comp and level streaming STILL don’t work properly when importing from WM. This is pretty disappointing actually. So what process are mods like the Center using to successfully make a large map work on this kit?

Correct, WM does not work as intended when importing to ADK - i never was able to resolve this issue (havent tested in a year, but, im 100% sure its still broken)
Center map was hand made, he didnt use world machine or creator to make that map.
I once made a map that was max size avail for UE4.5.1 / 4.7 (used for Ark). As long as your landscape is between 1.2mil X and -1.2mil Y (i would say X Y 1mil and -1mil to be safe) then you can make it that size. Replication is your limitation. Well, that and using UE4.5.1