Congratulations for this work, I think that will inspire me to make my box.
In fact what would be good for the backup / restoration of the game sessions is that the game board is equipped with small plastic inserts to put the cards. A bit like the game "Mysterium" do you see what I mean? We could then let the board store the cards on their different locations and we would store the packs of cards (which is fast). Maybe it is feasible by sticking card protectors cross cut to easily slip the cards in. What do you think of that? I'll try but I'm afraid to damage the board with bad glue ... Sorry for my english, I use Google Translate. Good game to all.
Oooops! In fact it does not work for some location when you fold the board. It seemed like a very good idea but in fact it is very bad :-).