<< The LUG should offer to be curator of one of the castle MOC’s, if she needs a home for them. The LUG will keep it intact and take it to shows. I think that is something that she would want for her uncle’s creations.
First you need confirmation that they’re still intact.
That’s a nice idea, but it means you’d need to make sure you have a volunteer willing to store it, transport it to and from events, and do any set-up and tear-down that may be needed. It may turn out that you have plenty of volunteers, but it’s also possible that you’ll have zero. (I know I have my hands full with my own MOC’s, so something like that doesn’t interest me.)