It may not need to be repaired in the sense of gluing, etc. Have you ever seen Willie Nelson's guitar? It has a large hole in it. A crack from an f hole on up may only need to have a bit more humidity in its life. A player/appraiser will have to handle the instrument to tell you more. Once work is done, it may be that some value evaporates as it is all in the original condition plus playability. Since so many of these kinds of guitars have gone to collections (in places like Japan), it's great to hear of one coming out from under the bed.
Check this out:
http://www.youtube.com/watch?v=8CsgHWMUVR0 
