I don't have the CN cage, but I believe as long as they lock securely and leave no more than 1/2" spacing, your gliders should be safe inside for now. Hopefully someone familiar with CN cages will see your post soon and be able to help you resolve the issue without having to send it back.
Just a thought that may help though. Many people with the CN cages that have modified them without the middle floor and make-shift a drop tray function have tutorials, maybe trying to google or do search in thread for a tutorial on modifying CN cages.