User blog comment:Gen. Grievous1138/MORDOR ~ A COMPLETE MAP/@comment-32352572-20181022074202/@comment-33763020-20181026093437

I tested it and it works :).

You basically have to do some simple maths to calculate which .mca file is which area, then copy/paste these files from Gen. Grievous1138 's region folder (in the Middle Earth named folder) to your region folder. It will not only create the builds, but the NPC spawns are still appearing based on the biome, which is great. In fact, Gen. Grievous1138 may have created NPC spawns himself, because I noticed that there was a tower captain in the Black Gate when I took it with my forces. Mind you, these chunk changes will show some chunk-breaks where they border your existing chunks, which can look quite ugly.. I have read somewhere that you can do something about this but haven't come around to it. Also, make sure you copy all area files that belong to one build, or you may end up with a half-Black Gate for example :).

As for the maths and calculating which chunk is which, follow this method:

To replace an area in your map by a build, you need to know which area that is. In order to check that, you need to know the coordinate structure. Luckily, the file name IS the coordinate area of the region. The file structure looks like this: r.X.Z.mca, in which X is the X-coordinate AREA and Z is the Z-coordinate AREA of the Middle-earth map. The ccordinate AREAS can be calculated by taking the actual X/Z coordinates (e.g. 84544/51392 for the Black Gate, based on the location coordinates on the map) and dividing them by 512 (because a sub area of a region is 32 chunks and a chunk is 16 blocks and 16*32 makes 512). For example, the Black Gate starts at approximately 84544/51392 (X/Z, as the Y-coordinate as height level does not matter when we talk about chunks, it will be replaced from lowest bedrock to highest sky level), which makes for area X-coordinate 84544/512=165 and area Z-coordinate 51392/512=100, so the file name is r.165.100.mca.

So if you want to leave all other areas intact, that you already visited and possibly have builds there or you changed the landscape, then you only need to replace those area files that hold those structures. This way you can play the whole game like you did before, but this time with the fantastic structures that Gen. Grievous1138 built! :)

I guess Mevans does not use other builders' builds on a purpose (as it would have to be on common agreement, a consistent building style should be used, costs a lot of effort to coordinate, etc.), so what remains is kindly asking the builders for their area files and copying them in. I saw in a Q&A video with SmileBC that it is done on purpose to leave open creativity for the servers to interpret in their unique way. It's a shame really, as there are a lot of fantastic builds that would be great to be moved over and most of us are not that creative or have time to build, such as Rivendell, Osgiliath, etc. Well, at least now we have Mordor in its full splendor with the monumental keeps to be conquered! :).