Try this:
- create a Unity cube primitive with the correct total size, set rotation and position to 0
- delete the Mesh Renderer and Box Collider component in it.
- put the floors inside the cube
- set a name for the cube and save it as prefab

Storey Separation is the space between 2 floors. In DungeonSet01 must be set to 1 to fit the stairs height.

About the lights, it depends on the wall orientation.

Try this:
- duplicate DungeonSet01_CorridorWall01Torch and move the particle system and light to the opposite side torch
- set a new name for it
- add it as additional variarion in Corridor Wall Variarions.

It should get more variation.

We have fixed the problem in the upcoming version of Daedalus.