Learn English – Is there one word that includes walls/ceiling/floor

word-request

Is there one word that includes walls, ceiling, floor – basically all the faces of a building?

For example I would like to use such a word in the following sentence:

"All the X of this building are made of wood".

Well there isn't any one word that is totally right.

You could argue that surfaces is right,

All the surfaces in this building are made of wood.

You could argue that just walls could means walls, ceiling and floor.

All the walls in this building are made of wood.

Or maybe you could say:

All the structure of this building is wood.

But really there are quite a bit of words you could use and it's kind of personal preference.