Creating a new map as a mod

The map would be similar to the test worlds that the team on stonehearth use to test. and you need to make it as elaborate as possible making a sustainable world.
You start with:
6 hearthlings
A market stall
A large tree
And some small food rations
would someone be able to help me make it.

The tiny worlds the devs use wouldnt be big enough but to support 10 hearthlings at the most and even then you would have no monsters to fight or any space for beds+farm+trapper fields

Yeah i understand that but why couldn’t we expand it to be about 1/9th the size of the full world.
But then we would also need a never ending supply of stone and other mined resources.