The movable alphabet and numbers were incredibly easy to make. I cut poster board into about one inch squares (not measuring at all), then used a marker to make six capital and six lowercase squares for each letter and six squares for each number. I splurged and bought the craft cases for them because I love cases like this and was thrilled to have a reason to buy them.
I can think of many uses for these and will hopefully have First Son playing with them as often as First Daughter.