UPDATE:: there are lots of better ways to do this. I just documented mine. I know this compromises pretty much everything that a good guitar should have. the thing is, my guitar didn't have those qualities. so that's why I did it. I've actually already gutted and thrown out the guitar (kept the insides for replacements, see), but it would work if you needed it to.
Step 1: Remove the strings of the guitar
Step 2: Remove the neck
note- there may be some glue holding it on. mine was old and has suffered some damage, so the glue was no longer holding.
Step 3: Remove the pickguard
Step 4: Remove part of the neck
you're going to want to take off some of the end of the neck. it's hard to explain, so look at the picture.