Great looking table and an original approach to its design. To quote what an officer says General Marcks in the movie The Longest Day: “Brilliant, Herr General. Unorthodox, but brilliant.” Nice video too.
Regarding the hand-drawn turn-order cards, one option that you might consider would be to find images of the roundels online, blowing them up in size, printing them out in colour and gluing the printouts to squares of stiff cardboard of the same type you’re using for the hand-drawn ones. The concept of movable turn-order cards, by the way, is a great one.