Nope, it is one piece of scenery. So the roof isn't in the game!
Ah, no not likely then. I would suggest making a suggestion topic with this in. There certainly is thatch roof in the game but I don't believe its the same type from what I have seen.
Its is possible. Really you can add just about anything to a standard roof to get different textures.
UMM... it is true..... Ive used the back of wooden cheif beef signs as a roof before... so yeah its possible.