Cool
But there is one downside in Skyline compared to most 3D engine supporting Prefabs like :
In the Scene entity list when you drop a preset on the scene, there is no more prefab or preset, but you see all entities that make the prefab in the scene list instead.
The goal of a prefab is to create some sort of new object group, in the Scene list we want to see the prefab and not it's individual obejcts to quickly select and manipulate this prefab on the scene.
Otherwise there you loose one biggest advantage of using a prefab.
Another prefab advantage is you can have child objects of one parent, moving the parent and childs follow keeping original offsets, same for rotations.