User blog comment:HubToo/Massive structures now!/@comment-25612015-20160117215010/@comment-26172435-20160117221241

Just adding some experiences here:

I can confirm the effective exchange of region files as I adopted this method on multiple occasions (on non LOTR servers) after Hub did it for me on hARDA. Generation of adjacent regions using the same seed will give a better result of course ...

SinzPet was very effective on his server (DotR) when smoothening out a very mountaineous area around my build Thoronbar when we copy-pasted that from a B24 to a B25 world. I believe he used some advanced WorldEdit tools for that job. We didn't use a region file for the copy-paste to minimize the smoothening efforts, but we used a region file of the old location and pasted it in the new world, to enable setting the right cut area for the later paste on another spot.