So, seventeen creatures, I recognize as humans appeared in the Everfree. From what I can understand, they soon ordered four to head off into the forest and gather wood, stone, and components. After a day of planning between four who stayed behind - who I will call the Clan Leaders - the four returned with literal metric tons of wood and stone, but no components.
They soon begin construction of what we now call the Ever Free Fortress, building a wall of stone topped with barbed wire to enclose the clearing for their own use, the only entrance and exit being the one gate pointed towards the end of a dirt path off the main road. 
After the placement of a border, the four leaders began construction of the main base, seemingly using magic infused blueprints that would construct what they called a twig base, which would be upgraded to stronger materials after the lower level frame of the building was placed and they needed to continue upward. 
They built a large base, topped with a cube-like rectangular floor, which seemed to be only for lookout.
As the leaders placed beds, furni, and storage areas inside the base, the eleven others began work in the courtyard, strangely planting small gardens of hemp plants, placing a few large furni close to the base, and lighting up the outside with campfires. 
This is where my writing ends, as I go and take the risk of a lifetime. 

Crossover with Rust, owned by Facepunch