Dont worry, I have been thinking all of these things myself. Fortunately, we have an agreement similar to the above which covers most of those points although I don't think the fire/rebuild one is in there.
My main worry is that this new lady doesn't know about the agreement and thinks she might be onto a winner. I know that makes me sound quite callous but I am very wary of that kind of nonsense. And the common law thing. We have a similar law here. I shall be watching closely to see what arises out of it.
Who knows, they might just buy me out and I can be a happy man!
Fingers crossed that it all goes according to your master plan. ;-)
I am sure that one day it will. I had to double check Scots law again there although I did at the time - I feel less antsty now.
Long term plans for the win!