Board Thread:Suggestions forum/@comment-30575462-20161130004558/@comment-25565811-20161202222722

''TheRandomizer2 wrote: ... it would be possible to make an "internal clock" for the npcs ...''

Not directly, because if nobody is near a chunk, it gets unloaded and nothing moves there any more.

But you could use LotR date for example: Add to the builder a starting and an ending date. If a chunk with a part of your building is reloaded, check the actual date.
 * If it's after the ending date, spawn the building instantly.
 * If it's between start and end, spawn the building partially, go on with the slow-motion-mode, Mevans added in the last update.
 * If it's before starting date, wait.

Your proposition is already implemented in the Millénaire mod. I am not sure, if and how it works with the LotR Mod. But I know, that you can add custom buildings there.

 ᚠᚠᛖᛏᛋ (ContentMod)