Now that I have SOT, I've updated my foamcore insert to pack everything into the core box and the SOA box. I've taken detailed pictures, and will gladly answer questions, but I'm not organized enough to make actual design plans, etc.
https://boardgamegeek.com/thread/1983923/my-custom-foamcore-insert-and-organizer
This is great! I'll be looking with great interest. I have a heap of foamcore ready to go, but had to change my storage idea after the poor Sanctum of Twilight box. If I can store everything and also not use any of the little boxes, I'll be happy. I've also told myself I can't start my foamcore project until all the miniatures are painted.