You know those walls you get when you smooth some stone? Yeah, this mod adds that as a buildable structure, has the same stats as a normal wall, but looks smooth.
Load Order
This code simply extends the Wall definition and changes the texture, that's it. If you have mods that change how the default buildable walls work, make sure it is above this mod in the load order so that the smooth walls have the same functionality. If you experience a weird error, then you probably have a mod that accidentally rewrites the vanilla walls definition, and should try moving this mod up the load order.