Map Creation, Textures

Okay, so I started making a revamp of the vanilla map Utah, I originally began on someone else's edit of Utah, I quickly realized if I continue this I might want to release it on the repo. but with where I was at that would mean posting someone else's work too, which I wont do. So I created a new copy of Utah, and I started building my map, when I created the map, it pulled textures from the edit I started on, so now when I delete the other persons maps, I lose tons of textures, I need to know if there's a way to fix this, or I should just start with a blank slate. I've also had other encounters with texture issues aswell, anytime I ported over the sawmill from eca the roofs texture would not come with it. If you need more info to answer my questions just ask.

Thank you.