I have been working on building the cubes (with the help of my talented father) for the second step of the map translations. I have them almost finished, just have to sand and then figure out the threading and hanging. They are about 5.5 x 5.5 inches. I think I'll either use a black, tan, or white thread - leaning towards the white to have a relationship with the first maps.
I began by making a mock-up with some scrap wood to get the dimensions right and to make sure everything would go smoothly the way I pictured it in my head.
Here's some photographs of my process: