Nice work Applemacster
Alternatively just get a drill (large diameter drill piece obviously), create a DA42 stick-shaped hole in the middle of your A4 kneeboard and away you go. Some would say it might cause you some restrictions with the amount of control input from the stick but that's the pessimistic outlook - on the plus side it would stop people overcontrolling the aircraft when chasing that sodding NDB needle.
Or you could use two A5 kneeboards - one per knee of course.