The meshes are replaced through the plugin, you can still use mods like Blended Roads so it's roads are still used in places I didn't mod.
The mod is flagged as ESM and requires Backported Extended ESL Support if not using the latest version of Skyrim.
I made some patches for snow textures, but the mod will require patches for mods that change landscape, I don't plan on making patches myself, because I want to work on next mods, but anyone is welcome to make a patch hub if you want to.