This Mod makes Smooth Walls and Floors buildable.
If you smooth natural rough rocks or floors, you get a nice looking smoothed version of it.
This Mod let's you build these since you can't rebuild them if they are destroyed in vanilla.
For the smooth floor you need to have researched stonecutting before you can build it.
Known issues:
If you have the Mod Impassable Furniture installed, make sure the wall is set to impassable. Otherwise your colonists will walk trough the wall!