How about we make a underground highway through the world?
We can say we build a main road looking like this,
With a standard of 5 tiles wide, Pillars and Milestones outside these 5 tiles for free passage.
Then people can connect their own branch roads to the main road.
Any obstacle like a village or a underground lake or river will be dug around.
To avoid villages as much as possible it might be best to make this road on the second underground layer.
This would also make it possible to transport large amount of cargo with wagons.
Also Inns along the way, with mine hole, charter stone, safe havens for travelers, house with beds and shops.
I could easily play 5 characters at the same time for this,
while 3 are mining, 1 is paving and the last one is building milestones,
pillars and gather water and food for the other characters.
The starting point would be a bit outside of the CF going straight east to the center of
the map at the same Y Coordinates, preferably on top of a red line on the minimap.
Once the miners reach the second mine hole at the bottom center of the world map,
they will keep going east towards the CF well, and make an entry point close to it.
After finishing the well, going back to the South center checkpoint and start digging North.
At the world center We make another check point, From there we can dig either north, east or west.
I know this is an insane amount of work, but maybe if some villages that are interested in this, we can make it work.
Once I am done building my village i might start this project if no one else have.