Hi!
A very elaborate and nice design. You have built a lot of roads on the surface.
The central chamber is a nice idea as is the round throne room, although I personally prefer a rectangular throne room :) :) :)
As for encrusting/decorating furniture:
You have to make use of your stockpiles efficiently:
1. Have one dedicated stockpile as the closest furniture stockpile to the workshop where the decorating is to take place. Note that z-level changes count as 1 tile regardless of real distance, so a stockpile 1 z-level above or below the workshop is always the closest.
2. When creating that stockpile, make it a custom stockpile setting the custom settings so that it only accepts the furniture you wish to decorate (be as specific as you can).
3. If the furniture is in a different stockpile, 'q' that different stockpile and disallow that furniture type.
4. Wait until the furniture has been hauled to the destination.
5. Order the decorations.
I am currently not sure how the priority goes, so if you are worried that the first item could be randomly picked, do the following in 5.:
Cut green glass
Encrust Furniture with sapphires
That is, before the first decoration order, have the workshop do something else that does not involve decoration. This way, the dwarf will be in the workshop (most of the time) before she starts on the decoration job, thus definitely making the dedicated stockpile the nearest one.
Once you have done all the decorating there, you can change the settings for the stockpile for other tasks.
Anyhow, that is really an interesting fortress with a lot of circles indeed. Thank you for sharing.
BTW, you didn't put any roofs on your surface buildings? Or did you just leave out that level in the maps as there is nothing else? (roofs on surface buildings are one of the few things you should no longer do in 31, so it is one thing I would be envious about :) )
Deathworks