I've been looking around trying to find some thing really different to do with my old epiphone sg special, so i was wondering, would it be possible and how would i do it if i cut like quarter inch thick shape out of the body, and filled it in with a piece of mirror? maybe just something small like a hook shape or something in the corner
you can actually buy sheets of inlay material, pearloid or whatever you want, but if you wanted mirror im sure that would work too if you can get it cut.

But I see no problem with this, especially if you have access to a cnc or a router or something.
Faded Gibson SG Special - Black ice mod
Seymour Duncan SH-5 in bridge
B-52 AT 112
Ted Weber Mass100 attenuator
EHX Small Clone
EHX Metal Muff
DIY Modded tubescreamer
Dunlop 535Q Wah
Wax Potting tutorial
If you can get the route nice and clean, and fit the mirror nice and tight, you might have the most badass crappy guitar ever.