I know how you feel, I am moving into a new house in October and I have begun packing up my MOCs. Just from settling, the packing process and moving the storage containers I can see that I will have days of sorting just to separate the parts back into my collection.
None of the castles will be rebuilt. I can already see the destruction inside the tubs
They are definitly beyond repair.
I may try to document the destruction of the castles for a possible story later on. Hopefully I can set up some backstory for the new castles I am going to make.
My village buildings are a little safer so I am hoping they will be intact enough to create a decent display. My new house will have the room I need to have a permanent display
So despite all the work I have ahead of me, I know things are bound to get better. So I guess my experience will be positive in the future, but right now it is a little sad looking over at tubs full of ruined castles. Good luck with your repairs.
After a long absence, I have returned. I can't wait to start building again.