I'm not at home to take a picture, but essentially I think - using some rough measurements - that given the thickness of my CP and the depth I intend mount the joystick, the connections on the joystick will more or less touch the underneath of the CP, meaning I may need to route out some space underneath as well.
OR I could just mount the joystick deeper into the CP from teh top so that the connections don't touch the CP underneath, but then the length of shaft protruding gets smaller and thus further away from optimal length, at which point all this fuss over making sure it's the right length becomes a bit meaningless (although actually for the sake of 1-2mm it's may not be worth the added effort of extra routing (i'm an amateur)).