I used the altar mesh a lot, it is one of my fav actually and I have some requests about it.
-Independant runes (with no stone behind). That way it could be used in more places, textures or even floating.
-The rounded base of the mesh also independant. Even a new one additional and bigger (rounded meshes are a need).
-More meshes with that stone texture, like a square plate to fit the runes, the pieces behind the altar, a wall… (That stoned texture it is great and we have not many of this style).