DISCLAIMER: Do not go without a working smoke detector just so you can hide things inside yours! You'd probably be better off adding a dummy smoke detector to a room that doesn't already have one.
This is my first instructable, so I hope it is as easy to understand as all of the great instructables I've read up to this point, that I am using for guidance. Any feedback or criticism is welcomed, as are upgrades or modifications.
Step 1: Tools and Planning
Tools: Any variations of cutting tools should work fine. I found the plastic to be extremely soft. A Dremel would have probably been a good idea, but since I don't have one I had to improvise. Besides that, all I needed was some hot glue, and a small screwdriver for prying the plastic tabs apart.