anything bad happens if two mods change the same navmesh?

one mod adds a door to one side of the cell block with navmesh; the other mod adds a door to the other side with navmesh.

It won't stop you from opening the door amirite?

btw: Anyone Know how Alternate textures work? Can these be merged from two mods into a patch?

Do they overwrite the nif textures? or is it randomly added to instances of the weapons