Well, you are basically getting a rim with posts and a frame. If I was getting this piano, I can't imagine I would keep the strings or hammers, and the action would need to be either replaced (which is kind of a crime from a historical instruments point of view) or completely restored. Pin block and soundboard replacement complete the picture.
With the money that costs, you can get yourself a nice new piano, which severely limits what makes sense to pay for the carcass to be rebuilt.
Don't get me wrong, I am all for rebuilding. It is just that the raw piano has to be fairly cheap for the whole thing to make sense. I was offered once a beautiful Bluthner for about 10,000. Plus 35 that puts the piano at 45, which is too much. I offered 1,000, since at 36 that's a pretty nice piano, and I was laughed at, but I believe the piano was available for a long time after I turned it down. I don't know how much it sold for in the end.