humpty dumpty

We hired a plasterer last week. It's all making me very nervous. He came highly recommended and I have been assured that he is a "plaster master." But I'm still nervous. You see, our crown molding is not wood - it's plaster.
The main room I've been fretting about is the dining room. There was A LOT of water damage on the ceiling from the bathroom upstairs. It is still leaking (still trying to finalize a plumber) but not heavily. One of the plasterer's workers removed the ceiling and was able to save the plaster medallion but... there was molding damage! I've been told that it is normal - the water damaged the molding and he managed to save most of the pieces... still, can it be put back together again?

Before.

During demo.

Exposed rafters and pocket doors.

Look up - the missing molding!

No money. Just creepy cobwebs.