I'm going to take a look at the air-tite display cards. It sounds like there could be potential there! The aquarium idea would make a great display case, but I want to keep everything together and not make it easy in the future to break it up (more chance of it having a longer life and not broken up in the future)
I'm thinking of starting with my kids and work up to their Great-Great-Grandparents, 5 generations from 1878 (oldest identified GG on my side) to 2014 (my youngest child)- I do have some research and identifying to work on my wife's side.