Step 1: What you need...
enough tile to at least cover electronics (we used a 6"x6" piece from Home Depot)
enough styrofoam as tile that is at least a little thicker than a 9V battery (we got it from A.I. Friedman)
twice as much posterboard as styrofoam (you need a oiece for the front and back)
one recording module (you can get them here )
!!! once you get all that cut the tile, styrofoam and posterboard to all the same size !!!
Step 2: Making space for electronics...
Step 3: Chop the styrofoam...
NOTE: do a very little at a time. keep checking. you only need enough so that just the buttons are above the stryofoam.
Step 4: Chop up the back.
so. start scooping out that styrofoam. this is where you use the spoon to really get out a lot of styrofoam. once you got it deep enough for a battery, stop.
now take a pen and cut out a canal in the back for the battery wire. make sure the canal stops underneath where the electronics will be on top.
now take a pen and jam a hole through the styrofoam from the front to the back. make sure the hole's wide enough to push the battery connector through.