You'd have to build it around a good frame, or as GeforcebOY say's, another case would be best. Then you could create a unique design to show off at the next lan party. If that's what your in to.
Yeah; you'll need some metal to build around - but its a reasonable idea. Measurements will have to be precise thought and you can't go wrong on the Motherboard Screw Holes at all - which will have to be in metal.